From a Utehub thread about not selling tickets to BYU fans:

"In 2018 the season ticket holders sold their 4 tickets right in front of my 4 season tickets to a BYU family for the Utah BYU game. BYU was up 20-0 at halftime. They never sat down the whole first half and were really obnoxious.

We came back the second half and when we took the lead their son who was around 14 threw his half full water bottle at the crowd below him. The parents did nothing about it.

Please Ute fans if you don’t want to go to the game sell or give your tickets away to a Ute fan!! Don’t put your fellow Ute fans in a bad position."

I can just imagine a big, bad 14 year old BYU fan, in a sea of red, chucking his water bottle at a bunch of Ute fans. I'm absolutely sure this happened. And I'm even more sure his parents just looked at him with sad eyes and shook their heads, but didn't say anything to him. And I'm sure the Ute fans who got hit by the water bottle miraculously didn't notice it and didn't say anything about it.