Nazis were a political movement and party in WW2 Germany. The people who hate black people and Jews these days do not align at all with that party. There's actual terms like Neonazi which is rare as well, or White Supremacist. The problem with using Nazi to define anybody currently is that in most online spaces a Nazi is not somebody who wants to exterminate the Jews and create a white world, but somebody you just disagree with and think is mean.