But who gets to decide what we're allowed to hate and what we aren't allowed to hate? I fully agree that we shouldn't hate anyone based on their race, but I don't trust the government to stop there if we say its ok to make laws against hating (or encouraging people to hate).

And I feel strongly that there's no real way to objectively determine when antipathy becomes "hatred" or when someone is purposefully stirring up "hatred" as opposed to merely condemning something. There's no obvious line to cross, no clear definition. Any legal decisions would have to be merely subjective.