The topic of "hating" other teams came up in a recent Rondo interview, and while he said that "hate" is a strong word, he doesn't really feel the need to be friends with opponents.
"That should be everyone’s mentality. We are competing -- there’s no friends on the court. Even if you were playing against a family member like your mother, you still go out there and try to beat her. It’s just a matter of competing. We love to win, I’m very competitive. Anything I do, I want to win. I don’t have time for friends. I don't talk to a lot of these guys in the offseason, so why I should talk to them on the court and try to be their friend?
That's old school. It isn't always pretty, but it makes sense.