The My Little Pony fandom's most invested follower, ever. Sethisto may have built a site celebrating the fan comics, but Barneyfag made a religion of hating them.
He was dead set on trying to get the board to refer to ponyfags as "Barneyfags", since he wanted to drive home that MLP is a kid's show, but in his autism he instead took the moniker unto himself.
Today he mostly lurks /v/, but if you want to troll people with Pony images, his bot is always there to help you. The favorite is Anon's Pie Adventure, since it features a well-drawn human man with plenty of good reaction shots, and you wouldn't know it was a pony fan comic unless you read it.