We cannot understimate the time and effort that right-wingers have put into arguing that fascism is left-wing.Considering how frequently I've been called a Marxist Fascist on twitter I actually just doubt they know what a Fascist actually is. To them they're just words that mean "The bad guys" without knowing anything about the philosophy or theory around them.
I think the very quick summary is that right wingers like capitalism and individualism, therefore anything that's totalitarian / non-capitalist is left-wing, therefore, when you think about it (don't bother), there's no real difference between Marxism and fascism. Of course, the obvious issue is that the right wing is not actually about capitalism and individualism, that's just a phase it's been going through recently. As we see from the rising populist right, which seems to be distinctly lukewarm on both.