His facial expressions and incessant shouting are indicative of his bad attitude.
I watched the USC PS game and it confirmed my admiration for Pete Carroll. He treats his players well. They have fun playing for him. He smiles a lot during the game. I would think his attitude makes it easy to recruit good players.
Last night I saw Saban lean over and yell at one of his defensive players after he had tackled a Utah player on the sideline.