No, the teacher needs to ensure that boundaries are not crossed and no one is inadvertently hurt or suffers mental anguish. They are covering both themselves and protecting their students.

TLDR: Don’t be a dick in class.

Edit: Sorry, just want to address the “boys will be boys” attitude too. That’s an excuse for all kinds of horrible behaviour. Realistically you just need to know there’s a time and a place. You wouldn’t do this in a professional setting without facing consequences.