Why not? The friendliest people in the US are exactly in the open carry states.
NYC on the other hand has the biggest number of jerks per capita I ever seen. (No offence to all nice people from NYC, which there are still plenty.)
This really depends on what you look like. Open carry states can be very unfriendly if you look a certain way.
My personal experience is that LA has NYC beat on a per-capita basis (and possibly an absolute numbers basis; it has roughly half the population, so it would only need to be double per-capita to "win").