What are some good comebacks to Asian jokes?

Okay, so I'm a freshman in high school, i have this "friend" that always makes stupid Asian jokes as in making retarded sounds like "chi cho wong hong" and blah blah. Well this kid pisses me off to no end and I haven't done anything back. Also the higher cled guys call me China or Va-China but I'm not even Chinese. Plus they call me a chink which makes me even more mad. I was born in New Orleans so this makes me pissed off. I could just use some help. Plus on top of that I'm bigger than they are (not fat, muscular and taller) Anyone got any answers?