When I was a student, I interned with a labor law firm that counted many Teamsters locals as their clients (for those who may not know, the Teamsters is the name for the union representing truck drivers and warehousemen). This was one of the war stories I heard one of the attorneys tell.
A foreman in one of the locals apparently was a 6'2" man who wore dresses. I don't know what the PC nomenclature is for that.
He/She wanted to use the women's bathroom and the employer didn't want to permit it. This was twenty or so years ago before all this gender stuff became what it is now. The dispute ended up in binding arbitration, as required for almost all disputes arising under a collective bargaining agreement. The arbitrator himself was a grizzled old fella who had been in the trucking industry since Jimmy Hoffa was alive. The sides made their opening statements and then the arbitrator looked at the foreman and asked, "Do you stand or sit?"
The foreman wasn't expecting the question and stammered, "I stand."
The arbitrator said, "You use the men's bathroom."