And also many people define the word on a purely vibes basis, which is quite frustrating

This. I could see someone equating “authoritarian” to fascist, which then leads to OP’s post becoming this absurd nonsense:

I know too many anti-[fascist] leftists

oh are we gonna co-exist with the Nazis?

it also seems like a lot of leftists will say they are anti-[fascist] but then say Nazi lives don’t matter. It can’t be both.