What to do when your BFF called you weak and a crybaby?

Today in class, my BFF gave me a note saying she didn't want to be friends anymore. I wrote her a note back saying why, and she replied "Look, the only reason I don't want to be friends with you is because your weak and you cry over stupid things like not being able to eat lunch because of talent show auditions" OK, for the record, that day I was SOOOOOOOOOOOOOOOOOOOO hungry and wanted to eat, but the second I sat down, the teacher called the talent show auditioners to go to the music room to audition. Also, I'm NOT weak. If I was weak, I wouldn't fight back when someone hits me. I would just sit down and cry, which I DON'T do that. She's more weak than I am! What do I do about this situation?