Im in serious need of some help, im having a brain fart.?

My cousin got into a fight with this girl, on face book. Of all the places they could have battled it out that's where they chose to do it. This girl is seriously challenged. She is the biggest skank on our block and Im really sad that my cousin has even stooped down to her level. I want to send my cousin a little comment saying you really don't need to be talking to her but I want to say it in a way that will not only make my cousin feel better and get over it, but laugh too. I want it to hurt that girl. I want to say something just rude and sarcastic and make her take a step back and realize what a fool she is. After searching the internet Ive yet to find a quote or anything for that matter that is good enough. Can you help me put it into words?