I think most bigger cities have this same set of people, though I would guess SF has it more. I’ve certainly experienced it in Atlanta, and from former coworkers in Chicago/NYC/Boston as well. There are a lot of people who will complain incessantly about the place they live, and how it’s not as good as some other place.

A lot of those folks aren’t going to find happiness with their move but some will. The grass is always greener until you’re standing on it.