Maybe you got a Gun Friendly cop and he wanted to warn you about Ohio's laws (If he could actually tell you were coming from Ohio?) <-- I wish this came to my head immediately, instead of the "this could of ended badly" that did.
If that were his intention, he could have offered that information regardless of the answer to the question - or without asking the question in the first place.
Maybe he was conducting business first and asking out of curiosity. If I was an officer I guess I'd wonder, how many people with a ltch actually exercise their right to carry and do so on a regular basis? Obviously they don't have to answer truthfully so kind of skews the survey. What does surprise me is how many people that I know personally do not carry and do have a ltch.
But idle (or even professional) curiosity and the compulsion of an arrest don't mix. I couldn't imagine many people who are especially willing to "talk shop" in a manner that violates fourth amendment-protected rights during a traffic stop.