Quick lesson in tort law: The little bitches can be sued, and they can lose. But they are judgment-proof. That is to say, they have no assets with which to pay a judgment. The real target here is the parents, in the hope that some of them have assets or insurance that would cover such a liability. In order to get a judgment against the parents, the plaintiff must prove that the parents were negligent in parenting these little bitches - they had a duty, they breached their duty, and the breach was the proximate cause of the tort (defamation).
In short, nothing will come of this, but it does expose a duplicitous system of sanctions against boys, with nothing on the other side for girls who manipulate the system.