First of all, I agree with the previous poster who said you should speak to them in Japanese. I don't speak or understand the Japanese languge, but I would say something like "Does your Momma still dress you every morning?" or "You're so dumb, I bet you don't even know how to wipe your own ass!" If the bully doesn't understand Japanese, He/She will surely think you are cursing them(task accomplished). If they DO understand Japanese, you still have 'Shamed' them! If your parents would feel shamed if you told them that you like Anime, don't tell them!(task accomplished)
As long as you are a good person, DON'T EVER BE ASHAMED OF WHO YOU ARE!!