I thought Donald Trump was the silliest man in politics but I was wrong as Roy Cordato explains in We Need Separation of Bathroom and State:
In late February the Charlotte, North Carolina, city council passed an “antidiscrimination” law, scheduled to go into effect on April 1. It was aimed at protecting what, in the view of the city council, are the rights of those in the gay, lesbian, and transgender community. The centerpiece of this law was a provision that prohibits businesses providing bathrooms, locker rooms, and showers from segregating usage of those facilities by gender, biologically defined. Biological males or females must be allowed to use the facilities of the opposite sex if they claim that that is the sex they identify with psychologically….
While religious liberty is an important concern, the issue is much broader. This ordinance was an assault on the rights of private property owners and economic freedom, regardless of one’s religious beliefs.
The primary targets of the Charlotte ordinance were privately owned businesses that offer bathrooms, changing rooms, showers, etc., for their customer’s convenience. The decision of how to structure access to these facilities may, for some, be based on their religious beliefs but for many others it is a secular business decision. Their goal is customer satisfaction driven by the desire to make a profit and earn a living. The property that they use is privately owned, the investments that they make come from private funds, and those who reap the rewards or suffer the losses are private entrepreneurs. The bathrooms in their establishments are part of the product that they provide.
In a free society based on property rights and free markets, as all free societies must be, a privately owned business would have the right to decide whether or not it wants separate bathrooms strictly for men and women biologically defined, bathrooms for men and women subjectively or psychologically defined, completely gender neutral bathrooms with no labels on the doors, or no bathrooms at all.