What are some comebacks? Help please?

Okay so Im on Facebook and this kid is totally bashing me. Like his comment on my status was "come to my house and get on your knees and start mowing my lawn" So I was like "ew, no" and he said "why not its the best job your gonna get because your mexican" Im not even full, Im pissed but can't come up with any comebacks... what should I do?