The last BYU Utah game, I attended in Salt Lake BYU won on the doinked field goal by Utah at the end.
There were several Utah fans around us yelling a lot of garbage, but most of the Utah fans around us apologized for them and told them to shut up.
That’s about what I’ve experienced from most fans at any game at an opposing stadium. 95% are good, and 5% are idiots and jerks. Those percentages just change with different fan bases.
On the other hand, I’ve been at both basketball and football games at byu where I’ve had to apologize for the behavior of BYU fans to opposing fans, particularly if that game was Utah.
I think BYU is better than most schools, but not by a wide margin. In my opinion.