"Oh my God," he groans, burying his face in his hands and dropping back heavily against the back of the couch. "You don't think that because you don't know Sherry. I mean, in case you hadn't figured this out, I was basically the worst thing about his life until he was my age, and he let me off the hook for that because we talked about it."

The thing Tony is missing here is that he is, at heart, a good person. But he doesn't see why that should matter so much. Good people can still do bad things. It doesn't make the things less bad.