I OC'd in KY over the entire Memorial Day weekend. Visiting some family friends I received my only comment on my sidearm. It was a "Goodness, is that pistol?" and I said, "Yes, ma'am." and she replied, "Oh." That was it. Besides that even at the hotel walking in and out past the desk several times a day, even the clerks didn't seem to notice. I didn't notice any looks from people. Certainly nobody said anything. Even when we took a prolonged stop at a busy quick shop in Lexington in a well traveled area to stretch our legs and have a soda I didn't note any undue interest. Went to several stores including Walmart, ate all our meals out, etc.
Only person who eyeballed me noticably was a man in the restroom at an Indiana rest stop. I was washing/drying my hands and he kept looking at me and best I could tell from periferal vision, he was staring at my hip. After I was finished, he was still at the sink and I smiled and nodded at him as I walked out. Pretty much entirely uneventful (excepting my fiancee getting the chance to OC in KY which was kinda cool).