He sneers at Hythlodaeus' comments, but refuses to look at him still. Throwing a fit? This is an entirely reasonable reaction to a very sudden change, thank you very much! It's not that he doesn't understand Hythlodaeus' point, but this is no way to achieve the correction he's after! Certainly not in someone as stubborn as Hades.

Whatever snide remarks me might have said are stopped short when Hythlodaeus starts to blow dry his hair, and so Emet turns away from the bathroom once more to find himself silently sitting on the edge of the bed, his lips finding themselves resting against his laced fingers as he lets out a weary sigh, eyes closed.

The fact Dirk seems to favor this look is tiring in itself, but he has no words to argue if this might soften their relationship.