" he stated that he wasn't sure it was legal for me to be wearing a firearm "like that". "
Ahem.....he's not sure? I would have really grilled him over this. "You're not sure? What do you mean you're not sure? Before you do say anything else, you'd better MAKE sure you know what the law is. Now, what is this 'not sure' business again, exactly? Hmm? Go back and look it up, here, I will give you the website to do it"
Then again, maybe I'm just a smart@$$. But I'm sick and tired of people telling me what they "think" the law is, or what they "believe" it is, or what they "heard" it is, or what they "saw on TV" (like in a a FICTIONAL episode of Law & Order.)