Substitute teacher called my daughter a tramp. How would you resolve this matter?

My daughter is a freshman in high school. A substitute teacher called her a tramp in front of the other students in her cl because she wrote the words love and hate on her hand. She took this very offensively and said it was disrespectful. How would you feel if it were your daughter and what would you do about it? My daughter has never had discipline problems at home or at school. She is a very sweet girl.