No, it's really not. There are numerous states where open carry is legal. If some hysteric calls 911 and starts screaming about a man with a gun, the cops usual first question is, "Is he doing anything wrong? Anything threatening?"Believe that if you wish, but the responding officer(s) generally cannot initially tell friend from foe, so they are likely to treat all as foes. It's just the world in which we live.
Often that ends it right there.
If it doesn't, and the cops come out, they all know that the person with the gun might be a completely peaceful, law-abiding citizen who just happens to be carrying. They may be a little more alert than usual as they approach him, but they are NOT going to put him down on the ground without a better reason than, he is lawfully carrying a firearm.
This is not just speculation on my part. I have a relative who is an LEO in Arizona, where open-carry is legal. I have friends who live in other states where open-carry is legal, and who routinely carry. The cops in those states do NOT throw down on people, and prone them out, for nothing more than legally carrying a firearm!