One should respect that this place is called Cougarboard, not Holy War Rivalry Board. I think most Cougars are okay engaging in some friendly banter now and then, but as a Ute fan* I want to remember to be respectful of our hosts.
*It helps in my case that while I cheer for the Utes, I'm not a BYU hater, and have many friends and family members who bleed blue. I'm always happy to see them do well, and think the rivalry is most fun when both teams are at the top of their game.