Do you really think going to his place of work is the right forum of conversation?
First and foremost, his ignorance is no excuse to be pushed around and told where you can or cant shop; so, shop there if you like. You are not braking the law, it is your right, and the company paid many more attorney to come up with the policy. Dont be pushed around.
As well, I recently shopped at the Imperial Capitalist of Walmart to buy a few things from sporting goods and hardware; both by a secondary entrance in Automotive. Anyhow, with my items in hand, before I could check out to leave I was asked/made to leave by management. I listened to what he had to say and was polite, pointed out tactfully that Kentucky is an Open carry state by law, and mentioned that there is not a sign on the door informing me otherwise. - Needless to say, I felt at the moment that arguing with the manager would have been like arguing with a cop when pulled over so I left descretely and nicely. -----I have e-mailed wm corporate and wait for response. -then I'll continue in OC or leave it in the truck if it's policy but I'll go in with my holster still on. It's a visual awareness.