I've heard that San Francisco cops will still treat you like a criminal even if you have a valid California CCW permit. Any validity to this?
I suspect so. Several years ago, the Alameda police tried to arrest me and became quite frustrated due the statewide nature of my ccw. They were sure mad when they had to let me go.
SF policing is entirely political, and the command structure is politically beholden to the Marxists in charge.
The beat cops will lose their jobs over any action or report that differs from the dictate of the city leftist politicians, so they report what the mayor wants reported, the way he wants it reported.
The only people without political protection are the normal, law abiding people. They are the ones that the cops don't have to worry about offending.