No, it's not an SF Bay Area thing. I've moved to SF from the Midwest a year ago, and have been called racial slurs more times during my year here than in my entire adult life living in a medium-sized Midwestern town. Shall we assume that because you haven't had a similar experience or personally faced discrimination on the job that no one else has?
Exaggerating the status of "diversity hires" just ignores the harsh reality of rampant discrimination in the tech industry. And not just on the basis of sex and race, but age and disability too. There wouldn't need to be such a hard push for underrepresented candidates if it were a more welcoming, diverse workforce in the first place.