When someone who supposedly opposes fascism is trying to vehemently argue that the anti-fascists are actually the bad people, that's generally not a problem of them "being misinformed" or "not understanding what anti-fascism" is.

What's actually happening 99 out of 100 times, is that they feel guilty that *they, personally* are not doing anything against fascism, and rather than owning their moral choices and learning to deal with that emotionally, they desperately try to find reasons to argue that actually anti-fascism must be bad, because then their moral obligation goes away.

There's a reason that this happens so frequently among privileged demographics in particular... it's the same sort of "refusing to learn to deal with their own emotions" that you see when people refuse to face eg. their own racism or queermisia.