I'm not going to claim that SF is some amazingly perfect bastion of racial diversity, but if you're mainly only seeing and interacting with white and Asian people here, that speaks more to the circles you spend your time in than the city's diversity.

Other Bay Area cities have different distributions. For example Oakland is approximately 29% non-hispanic white, 26% hispanic, 23% black, 15% asian, 5% mixed, 1% other.

As an aside, I often cringe at arguments involving skin-deep diversity. I’ve lived in towns that bragged of diversity when in reality they tended toward the same monolithic affluent culture regardless of skin tone.

> As of the 2010 census, the ethnic makeup and population of San Francisco included: 390,387 whites (48%), 267,915 Asians (33%), 48,870 African Americans (6%), and others. There were 121,744 Hispanics or Latinos of any race (15%).

> In 2010, residents of Chinese ethnicity constituted the largest single ethnic minority group in San Francisco at 21% of the population; the other Asian groups are Filipinos (5%) and Vietnamese (2%).

So less than 5% Indian.

It runs counter to a lot of their narratives regarding diversity, immigration etc.

Maybe it's your neighborhood, some islands in the city look like a white suburb, like Noe Valley for example.