Peridot largely because there's a difference between seeming creepy and being so.

It isn't like your average anime waifu loving fanfreak started out obsessed in their thirties. While it's true that anime isn't just for kids, it is where most people first encounter it. Some folks just stay fans rather than developing other interests that replace it as a primary hobby.

It changes the landscape. There's a massive difference between someone that's obsessed with an anime teenager and someone that's actively trying to fuck real teenagers. Hell, there's a difference between that and pedophilia, but that's a semantic quibble, not substantial thing.

It's like the difference between fantasy and reality.

That being said it is called out to some degree or another. Not so much using an avatar, but the people that get obsessed with some thousand year old demon that just happens to look five catch hell a good bit. Even online, but most definitely in meatspace