.....................US business owners don't have the right to refuse to do business with people based on an arbitrary classification.
Suppose for a moment that you went to a college that refuse you admission or a restaurant that refused to seat you because they deemed you to be female, or too old, too fat, too ethnic (based on the last name you gave for your reservation), too ugly, too white (or too non-white, or a mixed-race couple), or too obviously of the wrong religion because of your hijab (or cross necklace, priest's collar or nun's habit), or they prefer not to despoil their ambiance with the presence of your handicapped child?
Ask not for whom the erosion of your fellow citizen's civil rights tolls, my friends. It tolls for thee.