Ignoring teasing works but if you can keep your cool, you can also take control of the teasing with these other ways and make it into your own game.
If the teasing is in the form of a question, ask your own question, it doesn't have to be relevant or even have to make sense but it shouldn't be insulting. eg "you're fat"..."your hair is in a pony tail". If the teasing is in the form of chanting something, nod your head to the beat or clap in time, maybe even do special effects noises. If the teasing is in the form of accusing you of something, pretend you are a psychologist and ask deep questions like, "why do you think you said that?", "what are you hoping to accomplish by asking that", "what will you do with information like that?" and say "interesting...." and look very very interested. If the teasing is in the form of blocking your way, then pretend it's a staring game and if they blink first say "you blinked first, I win".
You should get together with other people who are teased and find out other ways to make it into games. Once people see you're having too much fun, they'll stop.