What Should I Do About This?

My friend is being bullied. I've told them it's bullying and they should stop, but they don't listen. It doesn't make any difference, they're just their gross, annoying, mean selves. The one that's bullying my friend, George, is a such a bítch aśs he says "your mom" to anything you say. He think's it's cool, and if you don't use it, you're dirt. I've told the teacher and she said, "It probably means he likes you." then i said to George that you probably just like her and then he's like "why

this'll b hard 4 ur friend 2 get out of. she has 2 tell this kid to lay off & that she DOESN'T like him. if that doesn't work, just keep using new approaches til u find the right one like ignoring him, telling an adult besides the teacher, or something else. good luck!