There are many ways to stand up to a bully. Sometimes it involves, actually standing up, but really, all it is is removing their reward. I realize this isn’t helpful on it’s own, so let me give you an example of what I mean using social groups as the tool.
If your kid is being bullied, learn what works to get it to stop and teach it to them. Don’t allow them to continue to suffer. Once you learn it – share this information and pass it on. Thanks and good luck.