Oh I've known people like this in real life.

Have literally been sexually harassed by one who then pouted, giggled, and said "come on, you liked it."

Uh, nope, I didn't, but I guess consent is a concept that only applies one way in certain people's minds.

I don't know so much if its certain specific fandoms as it is just... generally being waaaaay too online / brainrotted / having very little real world social experience, and then that often coincides with just being neck deep in some particular fandom or set of fandoms.