Open carried in Kroger in Toledo, Ohio. (I live in Michigan, but very close to Toledo). I shopped for about 15 minutes, went to the self check out and was approached by a man who asked me if I was LE. I told him no, and he asked me why I was carrying my gun "openly". I said because there is no law against it. I know, I should have said first: for personal protection, but anyway, he said he was just with a sherrif's deputy at another Kroger and was told you had to conceal it. I set him straight on the Ohio law and said with my CPL I CAN conceal, but I don't have to.
I don't know if he was just a customer, or the store detective as he was not in any security uniform. To make a long story short, I told him I wasn't breaking any laws. He said thank you and I finished checking out and left. No other issue.