Perhaps it's a sexual thing. You know like if you are hit a lot as a child.
Perhaps Tankies learn to enjoy censorship and repression. That's the only justification I can think of for censoring themselves, it's pretty hilarious when you think about it.
It's their instance, you can check the wordlist in the config. It's the slur_filter_regex. If it would bother me too much I'd change instance or spin up my own.
I'm more enraged by shadow banning like on "other platforms".
It's not about being PC, it's about how the word is used. There's nothing wrong with the word as it's defined, but when it becomes a common insult it becomes less acceptable. Just like any other swear word.
Working (in French) with lot of people that are native English speakers, this one never gets old. We usually answer with "We know, that's why your wage is subsidized".