Children are stubborn but eventually give in. Of course the child in question has gone way off the deep end. Not sure if something else involved (Abuse) or parents gleefully rewarding/encouraging defying the norms. Either way, society should not be obligated to cater to any dysfunction that intrudes on the realm of individuals’ rational rights (This case the females’ lair of privacy in the bathroom); help yes, encouragement no.
It doesn't sound like either of these to me. But I think I've started to piece together what's probably going on here. It seems to me probably more like a case of overstretched parents who don't know what to do and have been misguided by "professional" advice. See my post 83.