I may have related this story before.
I’m a Cubs fan.
Back in the late 80’s I went to cub\cardinal game in St. Louis @ the old concrete jungle Busch memorial..
Upper-deck, down the left field line, only blue hat in a sea of red.
I stand up, turn around and in a foghorn voice yell “What the hell are all you Cardinal fans doing at a Cubs game ?”
Between the constant shower of peanuts and with the gorillas in front of us standing, we never did get to see the ball game
ROFL. I used to go to Oakland Raiders games. It was very risky for someone to even wear a shirt for the opposing team. If they said anything as you did, they’d likely end up in the hospital.