I hate people who constantly complain about reposts, or that a post "isn't funny" when it obviously attempted humour.
I could get saying someone posting a wallpaper wasn't funny, or a picture of a pony, rather than a pony comic that actually tries to be funny.
But when people say "What the fuck, this isn't funny. It shouldn't be on frontpage!" all I can think is "Well, it's just fucking subjective to opinion as to whether it is funny... Shut the fuck up and look for a post you actually like, rather than complain on one that you don't like."