How do I kill with kindness?

So this kid who's in all my cles is always really rude to me for no reason. He imitates my voice in annoying ways, says rude and sarcastic remarks to me, and is generally obnoxious and mean towards me. I would like to mention that I've never done anything to him, and he is unprovoked when he says and does these things. It's not in my nature to make snarky and snide remarks right back to him, but he makes me so mad! Sometimes I even want to punch him hard smack dab in the middle of his face, and I'm not even violent! I just want to know some ways to shut him up without getting into any fights, saying anything rude, or making him mad. Basically, like my question says, I want to kill with kindness. Please help! Thank you in advance.