Main evidence being they've repeatedly implemented segregation (chaz) and when they lost an election in Portland instead of just waiting until the next election they rioted and destroyed even more property. Just like Hitler and mussolini did after they failed to democratically grab power. They also use the fascist tactic of victimizing themselves in order to justify doing whatever they want to the "opposition" regardless of whether or not they themselves have done anything wrong.
Anti fascism is an idea, American antifa is a bunch of privileged brats who use their power to commit crime knowing their rich friends will bail them out
Because they only care about themselves, they don't want to help people who face hardship. They want to riot and destroy things for fun because they know their white privilege won't allow them to be punished
