That the most liberal place has such disparity, I assume.
So it seems the correlation between population size and 'rich people literally stepping over needled addicts' is not that strong.
People will stereotype Texans as rugged individualists ready to shoot you for stealing from a fruit stand, or Chinese as some heartless mass that will run you over and go about their day. But I don't see any cities in those places with such visible social problems.
Those drinking the SF Kool-Aid will tell you it's because of the weather being a magnet for homeless people, or some other such nonsense. As if nowhere else in the world keeps temps above freezing year round.