anything about BYU, and are always thinking and talking about us (BYU comes up in Aggie conversations early and often--seriously, if you haven't seen it, you wouldn't believe how much they talk about us).
Except when we actually play them, BYU fans pretty much don't care one way or another about Aggie fans. I know I never heard USU mentioned when I was on campus in Provo. Aggies are pretty much a non-issue to BYU fans. So I don't think I would call this a great rivalry.