I've open carried in the Denver metro area (not Denver itself) twice in the past week, and the first time had nothing said to me, anywhere. Friday though, my wife and I were walking from Old Navy to TJ Maxx, and I passed an officer talking on his phone in his patrol vehicle. Upon leaving TJ Maxx, he comes up and asks if he could chat with me. Im always open to talking to officers, being a former one myself, and trying to get some beta on the area, so I say sure, what's up? He asked if I was carrying on a badge or permit. I said I was not carrying on a badge but open carry was legal here, with or without a permit. I still showed him my permit, and of course he wanted to run it. Go ahead, I said. He tried to tell me it was a CONCEALED carry permit, which I replied that it was a Georgia WEAPONS permit, allowing me to carry any way I wanted, and any weapon I wanted. I told him that the reciprocity was good, and that I was well within compliance with Colorado state law (where it is only for handguns), which he acknowledged.
He said he knew it was legal to open carry, but some people in the area get kind of upset, so could I please cover it up. I said that I didn't mind, as long as it was a request, which it was.
So far, that is the only noticeable reaction I have gotten since I open carried here. There was a hiking trail thing when I was chatting to a person about the trail, and then they got a funny look on their face, and walked away with their group quickly. Maybe they weren't used to seeing open carry in National Parks, but I don't know if it was that or something else.