I don't think male-female interdancing is prohibited for Gentiles so this question is strictly for Jews.
I think they should be banned and I'm very grateful I never went to the one my high school had. I was never into that nonsense even when I did believe in male-female interdancing. I knew I'm Jewish and that "proms" are not a Jewish thing.
Why do u keep wanting to ban things? Serriously grow up. It looks like u want to infringe on alot of our civil liberties, and be "big brother"
Aren't you a religious Jew? Would Rabbi Ovadiah Yosef whom you love so much approve of immodest male-female relations?
Yes I am a religious Jew. But I wont force religion on someone by banning something that they want to do. Ill tell them its wrong, but if they dont listen I wont stop them. Kiruv 101, dont force anything on anyone, let them realize with time what is wrong and right. And I dont understand, are you a fully practicing Jew? If you arent, then how would you like it if I came to your home on Shabbat and took your Television away, or something that you want to do on Shabbat but is Asur? You explain clearly why it is Asur, then if they dont want to do it you let it go, and slowly, gradually, hopefully they will become Jewish, through understanding, and philosophy. This is a problem that I have with some of the Kiruv Yeshivot, the ones that take troubled kids after high school. They either force it on the kid and he follows the rules, but then when he leaves Yeshiva after a year he is back to how he was before. Judaism isnt a dictatorship, or a cult. We dont ban things, let people not do them on their own. It may take time and understanding, but eventually they will realize the truth. And it isnt a cult either. We dont brainwash someone to become religious, he should realize it eventully no matter how long it takes. Rambam writes that you have to keep on trying to help you fellow Jew become more observant through talking nicely, and soft to him, not by yelling at him and embarrasing him.