What's a good comeback when your ex is "playfully" making fun of you online?

[A]

So i recently broke up with my ex a few days ago and she was really sad and gave chase but gave up.
On facebook a few of her friends were calling me idiots and stupid(i know real B.A) but they are also my friends. Like that we have a good amount of common friends but they are much closer to her and side with her. She recently said "yeah your right hes an idiot lol!" knowing her she wanted to say something worse and put the lol! to make it look "playful" If i can i want to be friends with her in a few months so it cant be to mean, and the friends thing. I'm pretty smart and shes pretty dumb if that helps you think of a comeback.

Should I even respond(because they are trying to cheer her up (i think) and she joined in) or does someone have a good "playful" comeback that fits those guidelines.

[Claude]

Yeah, you should back off and let her vent; you dumped her, let her have some fun at your expense and take it like a man.