Most often, in the cases that get attention locally, it's not the oc that's the main cause of the problem it's the "context".
Two recent incidents come to mind. In the first the police are called to the report of a male standing in front of a convenience store, in the middle of the city, glaring at the customers "menacingly". He has a handgun holstered on his hip.
In the second, which occurred in a suburb of Portland, the police are called to the report of a male standing in front of a school with a rifle.
In both incidents the guys with the guns weren't going about their business. Both had obviously, and admittedly, posted themselves at a location " to show their support for the 2nd Ammendment".
I believe that the police would have been called, in both instances, if the guys had been standing where they were, holding double bit axes or anything else that wasn't typical and could be used as a weapon. The police were called primarily because they were acting suspiciously. I haven't heard of any situations where someone was hiking, fishing, hunting, working, target practicing, etc. in a location where oc is legal and there being a police incident.
I believe in the 1st Ammendment too, but if I stand on the sidewalk in front of a church on Sunday and spout profanities for an extended period at the congregation as they come and go, someone will call the police and they will respond. If I walked past the church under the same circumstances and uttered profanities I doubt there would be a police response.
Normally it will come down to common sense and context. Just because something is legal diesn't mean it's "right" at all times and in all places. Doesn't seem so difficult to understand to me. The police respond daily to incidents where no crime has occurred. It generally falls under the heading of peacekeeping.
Whether they are baiting the police, or trying to prove a point, those who act unreasonably do nothing to help those of us who support the 2nd Amm. In my opinion often they perpetuate and legitimize the myth of gun owners as "gun nuts".