in common with the team you 'dislike' most...but that is how rivalries are born: 1. close proximity, 2. competitive and 3. always playing each other.
I live in a family of ute fans. So it's crazy to me some of the people I respect most, are also actively cheering against me, and me against them. And I want so bad to beat them.
Fortunately, there are a lot of good people on both sides of this, and the older I get the more I value sportsmanship and self control. I'm committed to those things.