Fans mainly, their pathetic excuse that they support them because their Dad or Grandad did. Its like the whole of Britian stems from a United fan GRRR. Then its their superior knowledge about football that they would have you believe but ask them anything that doesnt involve the premiership and they look confused. The the team itself, how they always seem to get just enough injury time til they score. The arrogance of the whole club etc. Too many reasons really, I could be here all day lol