No disagreement on that statement. But I wouldn't call it all manufactured outrage. The fact is that the rules themselves seem to be focused primarily and unfairly on girls, such that (as in this case) the father can wear shorts but the girls can't wear leggings. An unbiased observer would probably feel that a girl in leggings is at least as appropriately attired if not more so than a man in shorts. They have the right to set their own rules, and those who disagree with those rules have the right to say so. That's why it's not the girls themselves who are complaining here but others who are disturbed by the rules
Give me a break. Shorts are sometimes considered formal dress for men. Police officers around the country wear shorts. Furthermore, dress codes will always impose more restrictions on women and girls because men have a very limited array of fashion. For men, it's either a button-down shirt or a T-shirt, Jeans vs dress pants and shoes vs slippers. Only hillbilly men wear sleeveless T-shirts, and only gay men wear very tight clothing. Women can wear anything from ten different types of jeans, long skirts, short skirts, mini skirts, one-piece dresses, one-piece party dresses, tank tops, LEGGINGS, tights, socks, shirts with high necklines, shirts with "low" necklines, tight clothing, very tight clothing, very very tight clothing etc.
Do I even need to explain the obvious? This is FAUX outrage of the highest order. You are flying free, shut up and wear what they tell you to wear.