You do understand that "open carry" means visible in a holster or slung over the shoulder and not being held ready to fire (finger near the trigger), right? Carrying it with the finger near the trigger is called "brandishing" and is a crime and will get an officer to draw regardless of color.
When officers get a call about an armed person walking around, they assume brandishing, especially in states where open carry is legal. Even when the caller has bothered to specify race and the dispatcher has passed that along. (Not so) well-meaning liberal idiots have called in "person with a gun" reports when seeing a white person walking down the street with a properly holstered firearm in open carry states and the police arrive and draw quickly unless they can very clearly see empty hands while on the approach. Perhaps you have heard of the term "swatting". I have read where anti-gun liberals suggest it as a proper response that will convince law-abiding citizens to stop openly carrying.