Conflicted.
I'm part of an amazing discord server but I'm considering leaving cause I find part of the admin's username offensive even though I shouldn't.
The part in question is an autism joke and I've never found those kind of jokes funny. Honestly, I wish there was a way I could tell them, 'Look, I really love this server, but I don't find the autism joke in your username funny. Please change it so I can have some peace of mind and not have to leave,' without sounding like a complete and total entitled jerk.
H'mm... That is a comlicated one, indeed! It's a weighing of the positives & the negatives, which can at times, prove difficult to do... I wonder if that Administrator has Austism? Would you happen to know? So, in other words, are they trying to be, "self-deprecating?" Because otherwise (& even so) it is in remarkably bad taste. And in my opinion, should be pointed out in a respectful fashion, yet one that educates, and illustrates the dangers that this sort of thing can bring. Of course they won't find it offensive if they're not the butt of the joke, or they don't believe it to be that severe of a "crime." (so in other words, more like a 'misdemeanor,')
I guess at the end of the day, when you are not in a position of power to make that kind of a decision (as to whether or not their name can be changed), then the question you have to ask yourself if the reward of being there, and a member of that community, is worth the risk of whatever harm is caused by the offensive username. Like I said, it's a 'tough-call,' indeed. And one that - in the absence of some productive feedback from the Admin - is going to put you in a difficult spot with which only you can decide best which direction, or how you'd like to navigate it (the decision) - would work best for you & ultimately then. . . Your health.