I personally hate just about everything related to the Tar Holes (the only two exceptions are I think it is a pretty campus and I tolerate my daughters cheering for their field hockey team).
That being said, I don't go for the hate directed at celebrities, or anyone, who have a public duel allegiance, or even understand the thinking much. It is not uncommon for people cheer for the same team (pro or college) that they cheered for when they were 5 years old - in fact I'd say it's typical.