Hey that girl over there is so stupid apparently in maths she asked if she could eat pi
Hey just ignore them, Social bullying is mainly spread by people meaning that most of the time its just a made up rumour intended to make someone feel bad or to make themselves look 'cool'. Social bullying can also really hurt the person it's about as every ones contributing to it by telling each other meaning every one knows and also being a bully by spreading it. Most of the time it happens when other groups of people attack others to make them look more in power.
So what can i do to stop it from happening again
Well sometimes its just to put up with it and ignore it as it will eventually blow over and if you don't give a reaction then people will also start to lose interest. Another way to deal with it if it starts to get repetitive is to inform your parents or teacher as it always better to tell someone than not to, You can also intervene early in the process to stop it from spreading further. Also finally remember if it gets really bad inform your principal so that they can intervene and stop it once and for all.