have a jersey on.
The kid is old enough, and presumably mature enough, to understand this. When players interact negatively with fans it is a bad image...and yet again BYU players fail in the spotlight.
I didn't see the entire game, so surely could be missing something but ultimately it doesn't matter.
Do your thing, ignore the rest.
When I was a young man and was prone to speak critically, my father would say: “Cynics do not contribute, skeptics do not create, doubters do not achieve.”
-Gordon B. Hinckley