It's always been like that. You don't see Georgia fans cheering for Kentucky during the winter do you? Or USC fans cheering for Stanford's bball team do you?
You may have your reasons, but you're still THAT GUY who likes UNC basketball but isn't man enough to like their football team. THAT GUY who picks and chooses his teams.
Why is it always UNC/Duke fans who have a different football team? Only those two it seems.
Oh no, I'm "That Guy"? Really man, if that's the only thing you can come up with with I'll be That Guy. And unless you are a fan of teams that are in the same state(usually your home state), or have some ties to a school, family or otherwise, we all "pick and choose" teams College or Pro.