Did you ever know a kid who would say something mean and then quickly follow it up with "JK!"? That kid was annoying.
I don't think it was a sincere effort. That's my point. Zed just wanted to be able to say mean things about people and not experience any consequences for it. And that's silly.
This fumbling around now is annoying. If he wants to be a mean person he should be a mean person. If he wants to be nice he should say he doesn't want to be mean anymore and be nicer. Changing his behavior and saying it's because I wasn't smart enough to handle his persona – and by the way don't criticize him for anything he said... What is that?