Can't help but wonder if you attended a game with the opponent's gear on (nothing wrong with that), but if you went in with an attitude, I can certainly see some IU fans dishing it out to you--hence your dislike for some. I've never had a major problem at IU with Hoosier fans--and I always wear my Iowa gear. Yeah, some good-ribbing from the frat boys who said the Hawks (who were unbeaten in the regular season) would go down, but nothing big. Same goes for the two dudes who were cursing the Hawks after the win and saying the Hawks suck. Scoreboard. But except for those two poor sports, IU fans were great.
Ditto basketball. Good fans in my experience and passionate.
Obviously your experience differed. And yes, Ohio State fans are a lot more obnoxious in any sport. My opinion, my experience.