Chelsea is really the main one, but even there, I don't really hate them that much and might even root for them under the right circumstances. Didier Drogba is really annoying, but unfortunately also really good, so there are limits to how much one can hate him. Cristiano Ronaldo, same thing. And Francesco Totti, who isn't actually all that good. That might be the closest I get to sports-hating anyone.

In all of the above cases, because of the attitude of the players/team. Drogba is aggressive and a compulsive committer of schwalbes, Ronaldo is a crybaby and Totti is... I don't know. Constantly smirking and thinking he's good.

Since I have so many teams and not a single one that I'll defend no matter what or root for against anyone no matter who, I don't usually care that much. The exception might be the Phoenix Suns, not because I'm that obsessed with them but because they're the only team in the NBA I care about. Of course, the thing with the Suns is that their weaknesses, much like their strengths, are very obvious to everyone, so one can't object much if said weaknesses are pointed out. Speaking about the Suns, how about them, huh? Best record in the NBA... for now, anyway.

Hm, yes, I've come to appreciate Drogba more over time as I saw some impressive performances from him. Not really for the rest - I knew Ronaldo was superb before he started annoying me.

There are many, many teams that I like, most of them in football/soccer (because you know, you gotta have a favourite team or two in every major league, even if I'll almost always root for the Belgian team in an international game, even if the Belgian team is one I don't like much and the opponent is one of my foreign teams; that's mostly because the Belgian team is inevitably the underdog, though), but some in other sports as well, such as the Suns. None that I'm that obsessed about as in your description though, no.