Forgive me for being repetitive, but just for the sake of clarity:
You own a gas station in the middle of a desert, I pull into your station nearly empty, you refuse to sell me gas because you don't like my haircut or my dirty t-shirt or whatever. ( I have money, am not belligerent in any way).
You want to exercise your freedom to not sell me gas, but if I don't get gas, I will likely die in the desert. Don't you have some responsibility here? Unless of course instead of selling me gas you'd like to feed and shelter me until I can figure out some other way to get some gas. I don't know what the law would say and that will vary from state to state, but don't you see some moral responsibility?
And it's the same with the grocery store. If you don't sell me food, well I can go some where else. But if no store will sell me food? Do you expect me to starve? Or move to another town?