Because of tropes like https://tvtropes.org/pmwiki/pmwiki.php/Main/CreepyCrossdresser from movies like Silence of the Lambs, Dressed to Kill, and Psycho. It puts the idea of men dressing like women as a means of tricking women to attack them into the collective unconscious.

Because Trump spent $19 million on transphobic ads during football games in battleground states. Because they need a Boogeyman to rile up their base.

It doesn't have to make sense. You might as well be asking how can the KKK hate people of color or how can Nazis hate Jewish people.

Because conservatives are smooth brained and small minded. They need someone to hate in order to make themselves feel superior so they don't feel like complete losers

They're conservative. The whole name is based on the principle that they want to maintain the old way rather than progress. I think it stems from fear of a changing world. The old world with the old rules provided safety, it was understandable, the rules were clear, and the rules didn't hurt them. Now some people are "attacking" their world, their rules, everything that offers them safety and understanding. So they feel attacked.

It's the same thing, but with another subject every time. Whether it is women getting rights, which threatens their safe world with clear gender roles. Or gay people, who threaten the simple rules like "boys love girls", "in order to be successful, get a job, marry, and get kids". Or non-white people getting rights. What if they vote for things that "we" don't want? What if "they" ruin the world that "we" got so used to.

Trans and especially non-binary people are just the next group in line that threatens their simple world. When men are people born as men and women are people born as women, it's way easier to force people into the traditional roles. The old rules still work, "boy marries girl, gets kids". And when they speak out about their "concerns* they are (rightfully) called out for it. So they become defensive and start doing whatever they're doing now.

Religion.

They have to have somebody to hate so they don't hate themselves so much.

They're a convenient political target because it makes insecure men not want to be associated with them. Believe it or not, a similar thing happened last time Republicans won the popular vote in 2004 - back then the issue was gay marriage. Bush went hard on opposing that and it helped him win.

Conservatives use fear to manipulate their constituents as their primary means to rally support. A minority scapegoat many of their supporters don't know in person, like trans people, are easily demonized by politicians and clergy to pretend trans folks are pedophiles and sex assaulters projecting their own party and priest crimes, it's the same thing they try to do with fear mongering homosexuals as a previous scapegoat to distract and deflect from their awful policy privileging the wealth class and harming poor and middle class people, they need someone to blame for their own awful behavior and choices.

It seems that way because the minority of people who are against trans people are very loud and obnoxious, and their voices are heavily amplified by sites like Facebook and Twitter.

some schmucks want to exploit the very basic fear of the unfamiliar, and they pointed it at trans folk to get votes or whatever.

I don't think it's most people. I (choose to) believe that's a loud minority.

I can only recall one instance of a trans person going postal. https://en.m.wikipedia.org/wiki/2023_Nashville_school_shooting

I see a lot of mostly correct answers here, but as a trans person myself I can't help but feel they are all missing the core concept.

People hate trans folk for the same reason "get back in the kitchen" is still said to women in any non-"traditional" role or the "angry black man/woman" is said about anyone advocating for their own rights. There are strict gender and racial roles that are enforced by our society so rigidly, that many have assumed them to be naturally correct laws of the universe. Anyone existing outside of those roles is seen as either mental illness to be corrected or malicious evil-doers wanting to cause trouble.

When in fact the reality is much simpler, that being human is a more diverse expressive and dynamic experience than those holding on to those "natural laws" would like to admit. To exist outside the role you were "assigned" is a threat to society that assigns the roles, ergo a threat to the very way of life for those who see gender, sexual and racial hegemony as innate truths.

Conservatives who hold high tradition are naturally the first to speak out and seek to regulate us back in to "normal society" via legislation but liberals are absolutely not immune. To reduce transphobia to a political wedge issue, while correct, doesn't quite explain the more innocuous yet quite prevalent transphobia inside left leaning spaces.

In a less direct way one standing theory is that it’s tied to cultural issues with gender relations and due to the lack of a cultural role for us (at least in cultures where that applies or where those roles were damaged during colonialism, which was very common). Then there’s also the oversexualization of trans people.

For the first one Julia Serrano does a good job going into a lot of detail for a big chunk of it, but the quick summary is that there’s two axes of sexism: traditional (one sex and that which is associated is better than the other, traditionally prioritizing the masculine over the feminine) and oppositional (that that which is associated is deeply connected and immutable). All sorts of people run up against oppositional sexism, from cis gay people to dudes who like to sew. But it’s likely necessary to reinforce traditional sexism.

Then there’s the lack of cultural space. It’s being built, but it isn’t done yet and until it’s been uncontroversial for some time it’ll be at risk. It’s the issues of “I don’t know how to treat them” and “it’s against god”. It’s people angry that their understanding of one of the most vital parts of their culture is being called to make space for something that’s new to them

Then there’s the oversexualization. Trans people all throughout the world have a long history of resorting to sex work to survive. That means that to many people our existence is seen as inherently sexual. I grew up where trans people only appeared on tv as tragic sex workers, jokes of erotic disgust, or Springer style freak shows, and the next closest depictions were as murderous erotic crossdressers (which many saw as the same thing). And so now here I am, one of them, demanding you treat me as an educated professional and a peer and a decent chunk of bigots will see my face as inherently pornographic and therefore unfit to display around children. They hear about teenagers wanting to transition and think of it as sexualizing them. And for a certain portion of people they’re mad that a porn category and type of exotic hooker is demanding rights

There’s more, and I didn’t say it all the best I could (typed it out off and on over a while between doing things as well as it being something I mostly break down in discussions with other trans people). But yeah, we’re different and we challenge basic understandings of some of the foundations of society and culture, but our liberation helps break down the issues you’re already facing and a lot of the time the requests we’re making make life easier for cis people once y’all get used to us being around.

I support trans people to do whatever they want to themselves but unfortunately one did shoot up a school https://en.m.wikipedia.org/wiki/2023_Nashville_school_shooting

Not that it really matters as a legitimate cause to dislike trans people, but the 2023 Nashville shooting at a school was done by a trans person.

Since when do conservatives care about mass shootings?

It seems like it's always projection with these fascists.

They are the ones whose "party" is full of violent sexual predators. They will never bring up the monsters (including their "president") on their own "team".