There's a lot of thing that piss me off.
Insult trolls: So you've read 4Chan and think you are clever with drive by insults? Uh even those poorly drawn cat-girls that comprise 8% of Deviant Art show more originality than this.
Second; on here as well as other photo sites people who put copyright blocks, watermarks, pay-me crap etc on scans of old photos/post cards/advertisements. If you don't actually have the rights by virtue of purchase or creation, how can you act like you do? If you altered it, collaged, warholed it, and so forth..sure but just scanned an old postcard and want copyright? What an asshole!