The trope of overprotective fathers threatening to beat their daughter's first love with a bat for looking at them or telling their 14-year-old girl she can't leave the house in shorts and a tank top because of how "men" will "look," is never a healthy parenting technique. Sexualizing teenagers and making them feel uncomfortable in their own bodies during a time when they're already in a state of insecurity and confusion about their looks is not "protecting" them, it's only making them feel less safe.
It's during a person's teenage years that they often sharpen their talents and skills and prepare for their future career, so fostering a teen's interests and supporting their chosen sports or activities is key for parents during that time. So, when a concerned mom decided to consult the moral compass of the internet otherwise known as Reddit's "Am I the As*hole?" about a conflict she got into with her ex-husband over their daughter's ballet attire, people were quick to offer advice.