Its a private business, let them do what they want and in turn, the customers will do what they want and either continue to do business with them or not. As long as the government keeps its nose out of it.
I do find the outrage a bit funny though. I usually go to a local sports bar every week to watch the Cowboys game and to a person, when the anthem came on, every single person's ass was in their seat, mouth full of beer and nachos not giving it an ounce of respect. But the second they saw a player not stand, they joined the outrage.
Now I know this doesnt apply to people who are outraged here. I have faith before all this became an issue, every single person here who is angry now, always stood up, be it at home or in a bar or restaurant. Right?