must be because they care so much about hating BYU instead of cheering their own team that it skews everything and puts them in frequent positions to look pretty pathetic. It's interesting that national sports media has picked up on this too.
Other fanbases aren't like this at all. I lived in Georgia and Georgia vs. Florida is a huge rivalry, one of the biggest. But when the two schools aren't playing each other, they hardly talk about it at all. They move on to their other games and other things in their lives. Utah's obsession with BYU is so bizarre, especially now that they are in the Pac 12.