Well, it's a normal human reaction to respond better to 'cuter' people and animals. Afterall, who prefers ugliness over beauty?
It's so true that good-looking people, men and women, will always get the better deal. They'll get much more attention, and yeah, they'll get better chances at a lot of other things too.
What's horrible to watch, is when someone pretty / handsome KNOWS they are drop-dead gorgeous, and starts to manipulate those around them for their own gain. When that happens, the ugliness within overrides whatever physical attributes they might have.
I had a coursemate once in night school whom everyone thought was kinda... well, 'not pleasing to the eyes'.
But she turned out to be such a friendly, cheerful and helpful person that everyone started to like her and suddenly, despite her physical flaws, she morphed into a beautiful person, all because of her wonderful personality.
Sometimes, we feel that the beautiful folks have the better deal, but do they really? Would you like to know that you're popular because of your beauty or because of your character?
And anyways, if one's beautiful, it's simply a matter of being blessed with good genes, not because of anything one did. That means, a lot to be thankful for but erm... nothing to be proud of.