Bad Meets Evil
It’s bad enough that Joffrey flipped on his word and killed his soon-to-be-wife’s father in front of multitudes of people, but to summon Sansa to look at their heads through a stick was plain evil. His little attitude and sheer lack of remorse makes it worse. Lines like “until it pleases me” and “will you obey now?” show how much the demons inside him really have a strangle on his actions. To find joy in pain? Evil.