In this case, unlimited means literally everywhere.

You do have the right to go barefoot in your own home. And in true public spaces.

But, a property owner can require shoes. Do I care if somebody is barefoot in the local grocer? No, not really. But, the proprietor might because they want to limit their liability (should something fall on your foot, a cart run it over, or a loose tack/nail somehow land in an aisle, etc).