If you're legitimately concerned, when you give him the tickets, say something in a joke-like manner, like:
"So... these are GOOD tickets- in the donor section. You're gonna be sitting with a LOT of serious, diehard uptight Cougar fans. So, if you and your hippy, nut-job Ute-fan wife want to get out of there in one piece, she better be on her best behavior. She'll need to leave her flask at home. And don't forget that I sit with these people all year long, so if your wife is singing 'Utah Man' all night, they're gonna be pissed at ME when I show up for the game vs. USC. Oh, and if Utah actually wins, you're going to want to RUN to your car."
Make it light, and funny. If he works for you, and you remind him that you sit with these people all the time, there should be no problems.
Some of the respondents on this thread need to read a book called "The Sneeches". (It's written by a doctor!) It doesn't matter if you're a Y-bellied sneech or a U-bellied sneech.