I just don't understand it, to hurt someone that hasn't hurt you, and for such a lame reason.
Such is the nature of the human species. You may not like it but this sort of behavior has always existed and as long a the human species remains alive it will continue to exist. You can fight against it, and more power to you, I do it myself, but it really is a losing battle. Damned if you do, damned if you don't.