Crowley and Tom Lucitor
Crowley shook his head. "Maybe to some. Not for me." Because he was a jerk. And he would continue to be a jerk to Tom hoping that eventually Tom would stop bothering him.
It wasn't personal. Crowley just didn't have any interest in teaching the next generation of demons how to demon. There were no demons like Tom in Crowley's world. Demons had been demons for all of time, more or less. Unless they were angels for a while, but that was neither here nor there.