Put up a No Whites signs in front of your businesses to really make some noise.

That's kinda genius ngl, even tho I'm pretty sure it's only applies to creative professions

Bad example. The cases where businesses could refuse service to a customer were due to religious freedoms guaranteed by the Constitution. Not liking Trump would not fall under that category. Not sure about the other example though.

In general though, I think this would be fine. As long as this business is not funded or supported by taxpayer money.

The more I see news about the United States the less I'm surprised

Ugh should have read "no sales to trump supporters or religious nutbags. Whoops those 2 are the same thing"

I'm personally offended by this, but...

1. Regulating my emotions is my own problem and no one else's
2. The business owner is well within their rights to do so.
   Just shop somewhere else.

I don't have an issue with any of this. Private Business owners can sell their products or services to whoever they want. Don't see what the big deal is. If you don't like it, there's plenty more competition willing to take your money.