He wanted to know if he was capable of committing an evil act in contradistinction to what his fate and his nature tell him to do; Raymond specifically decides to do the exact opposite of what he would normally do, to go against his instincts.
I hate it when you lie. I hate it when you make me laugh, even worse when you make me cry. I hate it that you're not around, and the fact that you didn't call. But mostly I hate the way I don't hate you. Not even close, not even a