Animals don't like things that are different. Different species of animals don't mix well for the most part. Often, animals that are born with different features are abandoned by their mothers. They aren't tolerant of things that are different. You basically implied that we are above animals, which I suppose is true in many ways. I would hope that one of those ways is tolerance of things that are different. Homophobia is more animalistic than homosexuality because it is intolerant.