Them saying rowdy and loud is good. Not sure I can believe anyone in the position to be able to move their seats would give a blind eye to a problem like that.
But there are 100% plenty of UU fans that become total jerks at sporting events. The BYU hate is strong. At the basketball game I put up with a problem guy right behind me for about half the game before turning around and starting a conversation with him. It took a bit to get him to talk without him telling me how much he hated BYU, but eventually he came back to earth and we were able to enjoy the game a little more. But he was epitome of otherwise fairly normal guy who just hates BYU so much he couldn't behave normally.