Just relax, grab some snacks, and watch a movie.
If I were you, I would let it slide this time. If he continues, you should tell a teacher and they would handle the rest.
You should talk to him and try to ask why he called you that. But before you do, you have to make sure your friend is telling the truth so it won't be awkward when you walk up to him. If you call him something back, it might make it worse.
thanks anonymous! You gave me my first question! If he is your best friend, that gives you an advantage. Tell him! He might like you too, take a risk. It may take patience depending on his mood and how shy you are. Good luck!
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To make the world better. If you need advice, just ask me.