I’m True Blue but not local. I’ve only been to maybe four games at the BYU campus. At one of those games a visitor started with a few F bombs. Those around him asked him to refrain because they had little kids with them.
The guy decided to take it in stride and smiled like, “Really?”. “Yes really”.
So it’s different. Really your experience depends on how you might deal with such a thing.
Have fun. It’s a friendly place.