Iowa fans are the scum of the earth and should be treated as such. I was too young to experience Colorado fans at their finest, but if they were like this, I hate them quite a bit.
Last time I checked, Iowa never had a nationally-televised game stopped in the middle of a quarter to kick out an entire student section for physically assaulting a team and officials with projectiles.
These so called rivals are pretty quiet until they beat NU a few times. I'm thinking about MU and CU. Iowa hasn't received a regularly scheduled NU beating for too long.