I was a verbal bully as a kid. I tell everyone who is being bullied to punch the bully in the face. Every single time, even if you will get beat up. You'll get beat up anyway but after a while, they will leave you alone.

All the talk about "just ignore them" doesn't work at all. The only thing that works is if you are no longer an easy target, and if they know that every time they engage with you, it will turn into a fight, they will stop targeting you.