What should you reply when a bully asks you ''Why are you so fat

What should you reply when a bully asks you ''Why are you so fat? Everytime i fuck your mom she gives me a cookie. 你们知道如果校园里的恶霸指责你“你怎么这么胖？”时，你应该怎么回答吗？ “因为每次我和你妈上床，她都会给我一块小饼干。” From @MeiPinTu