He raises an eyebrow at him, "and what does 'true nature' mean? I'm not just secretly reveling in the fact that I can be an ass and laughing about it like a litte goblin..." He doesn't like to be at all, really.

But the truth of what happened, how he operates, who he is now as some rotten fucking shell of a boy, no one wanted to hear it, so it's easier to just push them away before they got close enough to tell him he's crazy. It makes no sense, he knows Sheehan had seen it, but that doesn't make his behavior any more rational.