" We are right to say that we never dislike people without a reason. But the reason, often, is that it is not in our interests to like them; liking them won’t elevate our social status, aid our acquisition of material or sexual resources, help our kin, or do any of the other things that during evolution have made genes prolific. The feeling of “rightness” accompanying our dislike is just window dressing. Once you’ve seen that, the feeling’s power may diminish. "

― Robert Wright , The Moral Animal: Why We Are the Way We Are - The New Science of Evolutionary Psychology