People that don't watch an anime typically aren't interested in it. Yes, that is obvious, so you don't need to get pissed and make yourself look like an idiot about it.
Should I explain to you fundamental attribution error? What you're saying here is that instead of it being dependent on their circumstances or interest in comedy fantasy anime, you make the false assumption that they "are", fundamentally, as an aspect of them as a human being, one of two things -- underage, or illogical reactionaries to the tastes of others (like yourself), when these are not necessarily the case in the least. I mean, you're free to be wrong, and it doesn't affect me any, but it doesn't make you look superior if you pitch a fit preemtively when no one's even insulted you yet.