I think its much to do about denial. Of course its rude and sad. Anytime people make judge and close their mind thinking its their way or the high way tends to lead to this outcome.
Physical attractiveness...hmm...well, I think people that are blessed with the proper bones structure and symmetry think the World is a better place. I have known some models that used to think everybody got he same treatment as they did. I think this is again a bit of denial. I do believe physical looks plays a role into how people are treated and I for one have been guilty of treating someone who was more attractive better than someone who was not.