I dont see anything wrong with what the coach did. It wasnt violent and he certainly didn't hurt the player, im sure he gets hit harder than that going for a rebound. I think the media is blowing this way out of proportion. I think the issue is on the player for slacking off, and i agree that the way his teammates acted showed that he is the root of the problem.
Yes, no big deal at all. If you don't hustle, you're not showing people that you want to play. Being a leader of the team, Crabbe needs to man up and play the game the way it's supposed to be played, which he did in the 2nd half, hence the win.