How long you been away from the US, Ratty? Law enforcement hassles photographers here all the time. The cops don't even know the laws. It's not worth getting into a pissing match with them.
I have lived in the city of Chicago since 1970, and have
never had a problem with a Chicago Police Department officer about using a tripod on a public sidewalk. In fact, I have had pleasant conversations with officers about what I was doing, including an older officer who had trained on a Deardorff at the academy.
However, private security guards are always hassling me, even when on public ways. If I am on actual private property, I defer to them, but I have held my ground when on sidewalks. Of course, they don't know the laws of optics, and think that if I am 6 feet away from
their building, that I am shooting it instead of the building across the street or across the river, at an appropriate camera-to-object distance.