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To be serious, for a moment: bigotry (of whatever sort) is an entirely (fallen) human business, and can be explained by reference to the Seven Deadly Sins:

4: Sloth, in so far as the bigot does not bother to learn the truth about the object of his bigotry. Rather, he is quick to believe lurid falsehoods.

5: Anger, in which the bigot lashes out unjustly at the perceived faults of the object of his bigotry, whilst ignoring his own faults.

6: Envy, in which the bigot is motivated by wishing he had some good which the object of his bigotry is perceived to have.

7: Pride, in which the bigot convinces himself that he is better than the object of his bigotry ... often to the point of partially or wholly denying the humanity of said object.

It is also a violation of the Eighth Commandment ... in that almost everything which the bigot says of the object of his bigotry is a half truth, a distortion of the truth, or an outright fabrication. It can lead to violations of the Fifthe Commandment, as well.