Memes

According to Britannica:

Fascism : a way of organizing a society in which a government ruled by a dictator controls the lives of the people and in which people are not allowed to disagree with the government

While what I described is not centrally controlled by a dictator (and anyone claiming that Antifa was centrally controlled is a nutcase, I agree), the way Antifa as a collective behaves does try to "control the lives of people, not allowing them to disagree with them" - at least in my opinion. You're free to have your own.