If that's you argument then, I don't know of anyone outside of Arizona that cheers for the Suns. I don't know of anyone outside of Wisconsin that cheers for the Bucks. I don't know if anyone outside of OKC that cheers for the Thunder. I could go on, but don't need to. Your argument is bunk and you know it.
As far as BYU goes, I know very few BYU fans who live in Utah that aren't also Jazz fans.