Don't really hate the lad myself, per se, but I hate the people around him during his fights.
Frank Warren (the scrotum that became human) and that damn loud entourage (his family?) that you always hear during the action. Am I the only person that really gets annoyed by the screaming girl at every one of Khan's fights? Every time he gets hit, or almost gets hit, you can hear a wailing, prolonged scream coming from the audience, almost resembling what seems to be a woman giving birth to a tiger.
I hate her, whoever she is.