What genres have extreme elitists and gatekeepers that usually aren't associated with as such?

I saw someone once joking about "emo purists" like it was a ridiculous thing that could never exist and actually laughed....oh you sweet summer child. I've also seen multiple people state that they've found emo purists to be significantly more elitist and gatekeeping than metalheads just to give you an idea if unfamiliar.

I also was a bit surprised hearing about that with Todd's video on Faith Hill's attempted crossover album like country elitists are a thing, although yeah it's not surprising.