maybe because he's so easy to hate. im a sammy girl. anyway, i think with dean's character, it's written out in a way that yes, he has moments where you want to bash his head into the wall, but because of his sacrifices for the family, and his angst already in the plot; you can't do anything but give him more love because that's what he desperately needs and craves and not get enough of. whereas sam, he gets alot of love already from dean. he broods, he got into college, he sacrifices but he's the colder brother (non-intentionally selfish - and more occasions less emotional/deep - perfect role for boy king), the younger one, the kid; he got everything handed to him by dean and sure he broods, he's more 'emo' on the surface, but he's not as deep as dean. not a bad thing, just facts. i think thats why we tend to pick on him more. u get my gist?