If the property owner prohibits you from coming onto his property with a gun, then you have to obey. Its called private property rights... you have the choice of either not patronizing the establishment or leaving your gun behind. Its as simple as that.
“Its called private property rights”
Funny, while you are on your highhorse about private proeprty rights you don’t seem to mention the person as private property and the rights of that property, such has the right to self defense and private concealment. What’s next, the right to search my wallet?