This has not been my experience. I don't often open carry, but when I do around Arlington, VA (predominantly, filled with gun hating liberals), I get strange looks from people, but I've never been hassled or even approached by a cop.I don't think so. Again, depending on the officer responding, many don't think or like you expressing your right to carry. Hell many would prefer you to lose that right.
edit: basically don't act like there are not a shit ton of asshole cops out there and most don't even know their local laws.
I have been pulled over a couple of times when open carrying. I keep my hands on the steering wheel and tell the officer very calmly that I am open carrying. Never been hassled about it. Never asked to step out of the car; never asked to unholster or hand over.
Now, I'm about as clean cut, law-abiding, respectful, and polite as they come. I have to wonder if all the people claiming to be hassled by cops bring it on themselves because they act like douchebags.