Pittsburgh Pirates – I was 7 years old when they played the Orioles in the '71 World Series and I became absolutely enthralled with Roberto Clemente. A little more than a year later, when that relief plane bound for Nicaragua went down, I refused to believe he was dead because his body was never recovered. Probably took me about a year to accept it.
College football – USC
NFL – I was a huge Cowboys fan as a kid (I used to cry when they lost regular-season games), but I lost my passion for them shortly after the Jerry Jones regime began.
The teams I detest are the ones closest to me: the SF 49ers and Giants and the Oakland Raiders. I do sort of like the A's, though.
I completely ignore the NBA these days and as a lifelong Californian, I've never taken any interest in hockey. I don't get soccer and don't want to get it.