Full disclosure, I have one finishing up at Iowa this spring. My rule is that anything Iowa-logoed must include "Dad" on it. But I've worn orange and blue far more often there, and seen multiple Iowa - Illinois games over the last few years, in both Kinnick and Carver-Hawkeye. Good times, other than the crushing defeats in Kinnick. 100% loyalty to Illinois at all times, I can assure you.
I tried to tolerate, not like, Iowa for a while for my daughter's sake. But I lost it during the Krush / Boys & Girls Club fiasco a couple years ago. Did not care for the Iowa response.
My daughter then goes on to Marquette for grad school this fall, so the Milwaukee-based Illini can yell at me too.