Ha. They would have that in common. :D And Cain's had just about every curse in the book thrown at him, so personal insults would roll off him like water off the metaphorical duck's back.

If you want humiliation and degredation, though? Insulting Riff might be a good way to get him good and angry. Grinding Alec into the dirt because he'll never be half the man Riff is, etc.