Though different, when I was working at TGIFridays males were not allowed to wear earrings. In the front of the house because of appearence reasons, and in the back of the house (kitchen) for food saftey reasons. Can't have an earring falling into a dinner.
As a male with piercings I didn't mind the rule at all, as the employer sets the rules, and the possibility of an earring ending up in food was legitimate. But one day I forgot to take my earrings out before starting my shift. The manager told me to remove them and I did. No problem. But then I noticed that one of the female cooks was wearing earrings and I requested that the manager have her remove her earrings and the rules be altered to say NO ONE can wear earrings in the kitchen.
It was done instantly.