I don't think I am as brave as Cia, who speaks out against language of hatred. Well, I don't usually, though I've done such before. If more people are more outspoken on such issues and against hatred (in general, not just against sexual orientation per se), then world would probably be more exposed to the issue and sit down and talk about what made them feel that way. Most of them are ignorant of the issues, and don't realize their view points are hurtful. I've quite had enough of some of my relatives, but for the sake of social agreeableness and doesn't want the h*ll break loose, I swallow my pride and protest in silence.
If one's hatred was in-born, then I suppose it cannot be changed, or at least, it would run against their grain to be not resentful to everything. Not saying reformation isn't possible, nor should we judge by their inherited trait, as who they've become rather than what they were born to be that's more important. I was just watching Daria, but in her case, I think it was just teenage rebellion, which is a normal part of growing up, and I would think that might even have some biochemical influence or genetically induced. People do grow out of it, if it's just hormone. And people will become less vengeful, if the cause was ignorance and can be educated. The one people shall be wary of is the willing hatefulness, the one backed by reasons rather than out of irrational passion, as it is far more destructive.