Dean would have laughed at the insult had Claire not fallen to the floor of the shower. He was always the 'ass,' but the fury that she used when she called him a crazy ass, combined with the way she looked so completely furious. Still, he couldn't make himself laugh when she was sitting on the floor of the shower fully dressed.
"You'll thank me for this when we're done." He said quietly, hoping more than anything that he was right and she wouldn't be pissed off about it the way she had been when he locked her in the closet. When Claire was mad, when she stayed there, when he wasn't in her good graces, things got pretty frigid.