Crowley bristles. He's pretty sure that telling someone they don't want to know something is the surest way to make them want to know it and he's no exception.

"Like what?"

Maybe he'd resisted the other bait, but he rises to this one without much resistance. What's the worst that will happen? Dean's hardly an honest man. He's no Castiel, but he's told his share of lies and Crowley can easily dismiss anything he doesn't like as such.