Eduardo Najera - kissed the refs butts more than any player I've ever seen, we dominated the Big 12 during his career but I still couldn't stand the guy.
Outside of him it's mainly coaches I can't stand, Baylor's pro-murder coach, Baylor's post-murder cheating coach, Roy Williams are probably my top 3. I've only watched Marcus Smart play a handful of games, if he always flops the way he did in Hilton then he could be the new #1 disliked player, that was a disgrace.