A quick observation on open carry from the weekend.
Most people don't even notice. Those who do notice tend to fall into one of 3 categories.
1. Notice but don't seem to care
2. Notice and keep looking at the gun
3. Notice and are looking at you like you're carrying around dead kittens in your arms.
Surprisingly no one comes up to me and asks if I'm carrying because I have a small trouser monkey.
I'm not the scariest looking dude in the world though. Your mileage may vary.