I don't believe people are born to hate and much of it is learned from watching and listening to those closest to them, especially in the formative years. It may also be formed through negative interactions with certain people or groups as the person is growing up. Therefore, anything learned can be altered, not quite the same as being unlearned, but I think that depends on how deeply ingrained the hatred is. I believe the earlier one learns to hate something or someone, including groups, and the longer that belief is held, the harder it is to convince the person his belief is wrong. Such intervention would have to be done when the individual is younger or would take place closer to the time the hatred was formed in order to be effective. The longer that belief is held, the more difficult it will be to change it, unless something drastic or radical occurs. .