I really don't 'hate' shitty, I don't think many manc-born man utd fans do really. They're just as SAF so poetically put it, the noisey neighbours.
Utd/City is a bit like the Scottish/English relationship. They fucking despise us with a passion and we barely acknowledge their existence.
I've always hated pikeypool, because they're, well, pikeypool. (btw - karma is a bitch eh Carragher) and more recently Chelksi because they are 100% guilty of what United have always been falsely accused of. So are city since the buyout mind. I used to hate Arsenal but have mellowed on them because they do play attractive football and Wenger is very much like SAF and will always back his players up so I have respect for the bloke. They are frustrating to watch though,and I find myself yelling SHOOT SHOOT, JUST SHOOT THE FUCKING BALL! while watching them play.