Punishing a sexist high school student?

I’m a teacher at a dance class in a high school. My class this year consisted only with the girls. But recently school principal brought me a boy, saying that he’s under punishment for saying sexist statements about the girls, like the girls must always be “barefoot and pregnant”, and I should teach him respect for the girls. He’s been with us for just one class yet and the girls already hated him begin too arrogant and stepping all over girl’s feet during the dance. So some girls come to me after the classs and suggested me to punish him for that which was also a thing that principal encouraged me to. But I don’t what what I can do to punish him. Do you have any ideas?
Punishing a sexist high school student?
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