Constantine likes to think that he doesn't care about anyone, and he doesn't think of himself as being too dangerous, so it wouldn't matter to him whether he snapped or not. But he doesn't like getting played with. He doesn't like not having anything up his sleeve. This helplessness, feeling trapped, it makes him feel too unsettled.

"You are a sap." He's not yelling though. Actually he's more confused about how they seem to like him when he leaves his shit lying around everywhere, snaps at them sporadically and eats their food all the time.

"But I've still got a couple of ideas to try yet, so don't go screaming and weeping before I'm done," he scoffs.