The Yankees by far. People that don't even like baseball hate the Yankees. By some people reactions, you'd think that by telling them that you're a Yankees fan you told them that you're a crack addict or that you go out with 13 year old girls.
My brother is a Texas Rangers fan and he roots for two things during the MLB season-the Rangers to win the AL West(which will never happen) and the Yankees to lose(which he doesn't think happens enough). He was unbearable this weekend with the whole,"the Yankees are out!" nonsense.