If you don't want to be "one of those fans", you could just say you were cheering for the Big12.
Although, I am one of those fans. I find happiness in a hawkeye loss.
My friends and I are going to paint our bodies for the game tomorrow night and we need some help thinking of what to write. We have 8-10 people willing to do it so far. We're open to anything creative! Hopefully you'll see us in the front row!