No, no, no. This is not acceptable reasoning - he's a sophomore in college. If he's lashing out because he's not dominating and frustrated that he's not going to be an NBA draft darling as a sophomore, then that's a problem. I don't necessarily think that's the case, but he hasn't seemed himself to me in a little while (and I've pointed it out and been hard on him lately - and have been criticized on this forum for doing so).
But he has not been playing like the POY - Big Ten or National- on a consistent level, particularly on the offensive end (although he's not a good defender - he's a great rebounder). The guy was MIA in the second half on offense, is starting to shoot and not make 3s (maybe he's starting to hit a wall, but he hasn't been making 3s lately), and was only 5-13 yesterday.