There are plenty of people who cannot afford to live in a safe, or even reasonably safe neighborhood. There are people who cannot afford life-saving medicine or medical care. There are people who cannot afford to send their children to college, or even before that to buy them the iDevices and computers that would give them an edge in their education. There are plenty of families who have not bought new clothes in years because they simply can't afford it after the necessities have been paid for.
This is happening in the U.S.: in the East Bay, just a few miles from SV; in south-central LA, in most of San Bernardino and Riverside counties, in Detroit, in Cleveland, in south-west Chicago, in New York, in New Orleans...
Blog posts like this just reinforce the common perception outside of SV that Silicon Valley is now populated by a bunch of wealthy, out-of-touch individuals who have no understanding of how hard life is for people who didn't hit the jackpot in terms of family, upbringing, or education.