> There is no such rule in the U.S., although a lot of people mistakenly assume there is one.
There certainly is such a law. It's not something to be proud of.
> In US law, public accommodations are generally defined as facilities, both public and private, used by the public. Examples include retail stores
> Under United States federal law, public accommodations must be accessible to the handicapped and may not discriminate on the basis of "race, color, religion, or national origin."
https://en.wikipedia.org/wiki/Public_accommodations