Feels like there’s an increasingly strong idea that racism is ok as long as it’s targeting at undesirable people, as if that’s a new concept and isn’t how racism has always been justified.

To racist it's always justified and their target deserves it. It has never been any other way. Same with any other kinda hate and dismissal. They will always deserve it. I do a shit take, anybody who thinks it shit think I deserve the hate and ridicule. The difference is just that black man can't stop being black, but an idiot can recant their words. The logic behind them is always the same.
Aren't there also fanatical kamala supporters that unironically think that Kamala was the only way and anybody who thinks otherwise at least deserves to be called an idiot or maybe even deported or other things done to them. That is what it does when one falls into the idea that their deeply held subjective worldview is actually the objective truth, especially things that are fundamentally passionate and subjective like politics. From there it's not a very long leap to think that if you are objectively right then everybody else is just wrong and they are either ignoramuses who are unwilling to be thought nor can be reasoned with, or they know the truth but are full of some malice and act against the truth anyway because of some selfish or dark reason. Both cases will logically lead into escalating violence against those who you disagree with, once you have crossed that bridge form subjectivity to objectivity. Even in things like democrats becoming the thing that many blamed the republicans were when they start to feel pressured.