Any real photographer would have just photoshopped you out. Must have been some antiquated analog type.
Seriously, though I've run into this many many times. I politely ask them to move and explain the reason and they always kindly move. Often I offer them a gift certificate for a portrait session and 8x10 that I carry with me.
Never once had a problem and to the OP, Wayne, thanks for moving.
Certain locations are so important to us.
Done this way? OK. Done with a air of entitlement? Find another spot.