Honesty, I have never seen such a huge and obvious gap between rich and poor, than in San Francisco. It's a very weird place. On the one hand, you have people who literally live in the streets, and there are still thousands of them. There are people who barely make it in San Francisco. Then, on the other hand, you have the STEM workers, who are paid 100K+ on average. Almost none of the of STEM workers actually work in San Francisco, they all get bused about 40 minutes to the south on these private and luxurious buses to the big tech companies like Google, EA or Genentech.
Sometimes I work in South SF and San Francisco, and whenever I drive up 101, I see dozens of Buses transporting these highly paid STEM workers. Then when I get to SF and turn onto Market street, I see so much poverty and despair. And the poorest of poor are almost always characteristically African America with Whites sprinkled in here and there. Rarely do I see even "the pisas" (New wave hispanic immigrants who are usually predominately Mezo-Indian) on streets.
The poverty shocking sometimes... At least that's the way it used to be. Now that all the Indians and Asian tech guys are moving in. The city is changing now. It's not really a place for art and culture. There are a lot of great places to eat, but it's not the place that I used to go to, as a youth, for Underground hip-hop culture and apparel. The people aren't into that stuff anymore. As with any city that is dominating by Indians and Chinese (like many cities in the Bay Area) The emphasis is on Brand names like Lius Vuiton or even garbage like Polo. Sorry to say, Indians and Chinese are just not into creative fashion or art. They are a sheepish-like people that promote an extreme form of Consumerism. For example, There is this bullshyt store that sells bullshyt clothing (Uniclo I think it is called), and there is literally a line to get into that store, and it is basically no different than Old navy or the gap. People only like it because it has some strong brand name in East Asia. I really don't get it.
All the artisans are moving to Oakland now. Oakland is going to be the next center of Culture in the Bay. That's my prediction. In fact, I prefer going to Berkeley and the East Bay now. I just can't get into all the Sheepishness, and the people that can't think for themselves. I get to see a lot cool and innovative things in the East Bay now.
San Francisco doesn't seem to be a place for anyone over 35 either. I have heard someone call it never never land.
I'd say S.F. and New York are easily the most liberal cities in the nation, but thats just my opinion 
