Talking smack is part of the game. It goes too far when you start punching people and going after the crowd.
Penalities are a
part of the game to. Why no penalty flag....simple...the game was over! I am in no way defending the dude....however, the game was finished.
Purposely tracking down a player so that you can taunt him shows a lack of sportsmanship. Cold-cocking a player after being taunted takes that lack of sportsmanship to a whole new level. Attacking fans.....well I'm sure the NCAA will handle that poorly thought out choice.