Screaming out like a bunch of wild baboons always annoyed me more than sledging. Though sledging should really only be in the context of the player and the sport 'you're a bit of a fat cunt mate, you need the runs', 'you handle that bat like your cock', etc. It's when people take it too far like racial slurs, insulting family members, making it personal, needlessly aggressive and what not that I draw the line.