1) Domers uber alles! ND fans have to be the worst that I've ever encountered; plus their Ohio State hatred is absolutely rabid.
2) Miami. I really can't add anything to what's already been said--Well, OK just a little. The day that this country is rid of these cheating, thug-loving, aqua velva splashing, camaro driving, never went to the school I root for, NJ retards, the sooner we can go back to being a rational, college football loving nation.
3) Fredo of Ohio (or Miami of Ohio) Trust me for every closet Buckeye fan that chooses to matriculate at that overgrown boarding school, there's two out-of-state Northwestern rejects that were lured to Oxford only to find that they're not even the highest ranked public school in Ohio; and, boy do they pile on the hate and slander in response. Add to the historical fact that the administration of that overgrown boarding school has tried to pull a Fredo on us for over a hundred years and...
4) West Virginia...Well just because!
Who I've left off...
1) Michigan. Forgive me Woody, for I have sinned. Damnit, I've studied in grad school among UM grads, worked with UM grads at the State Department and now live among many in Chicago. They don't bother me. Sure, there's a rivalry, but the smack is generally reasonable, intelligent, good natured and respectful.
2) USC. Yes, there is a huge amount of arrogance. However, I've always found that both on the internet and in person that a very small amount of personability will cut it all away. I guess that I see their arrogance as being more of a defensive reaction in two regards: 1) being the third ranked academic school in their own city and 2) a decade of really, really sucking.