Went to a friend's house and mentioned how the Cougars were doing. He exploded. "I [bleeping] hate BYU!"
In my naive pre-teen mind, everyone loved the flagship program in the state. I asked him, "Really? Why?" He had no answer - just that he hated them. He said a bunch of other things, but it was my wakeup call that people actually had an irrational hate for BYU.
Yeah - that was in the mid-80s. Hate for BYU has ebbed and flowed, but it has been there as long as hate for LDS has existed.