I don't think you've been on DeviantART alot.
Thats actually normal.
If you type in L4D2 you get Ellis x Nick.
I don't recall searching MLP and getting inflation art.
Deviant art is forgeted up.
Ponibooru is somewhat-less-forgeted-up-but-still-forgeted-up.
Unlike Ponibooru, Deviantart has an anti-research rule, but it's not enforced enough, if Deviantart could manage the huge community they have, most of the stuff i've posted would be blown off the site.
We could compare bronies to any fandom or to anything on the internet for that matter, and it would be the same, no matter how you look at it all fandoms have a forgeted-up side to them. None of them are perfect
Except My Little Pony has a fanbase that takes it too loving seriously.