The Comintern only called them fascists during a specific era which was right around when fascism started emerging as a phenomenon. It's extremely silly to claim there is no distinction and proven wrong in practice, especially when online American leftists don't even seem to understand how the different stuff they call "fascism" is different. People should start actually analyzing stuff instead of using old aphorisms and pretending it's actually insightful. Yeah, you CAN act like everything ever is literally the same, except then your analysis will be nonsense.