I'm not worried.
I'm completely within the law carrying my pistol virtually anywhere in public, and that includes Wal-Mart.
I OC in Wal-Mart probably at least once to three times a week, depending on how forgetful I am, causing me the need to return. I've never once had an issue, and don't plan on having one in the future. What are they going to do? Report me to homeland security for being within the law? I'm shaking in my booties.