When did "fascist" become a taboo / slur instead of a serious political preference and what was the decline like?

by fluffy_muffin_8387_1

I am currently watching Peaky Blinders and noticed that some of the characters are quite frankly unashamed / have absolutely no qualms about identifying as fascists and some characters even flip from socialism to fascism with no moral qualms. I think nowadays, most would have a knee-jerk reaction to being called a "fascist" even if they were one. So how realistic was it for people to openly support fascism and did socialists ever actually cooperate with fascists like they do in the show? How did fascism become a bad thing in the public perception and when did this happen? What happened to the popular politicians taht were pro-fascism in countries like the UK / Canada / USA? Nowadays, I have a hard time understanding why anybody would ever want to identify as a fascist - what was the rationale for it back then?

crrpit

It doesn't go all the way towards answering all of your questions - I hope to find time when I can! - but some relevant links: