I rode the light rail in Houston once and a homeless man got aboard. His stench was so strong that my only conclusion was that he had been defecating in his pants for at least a few weeks without ever changing clothes or cleaning up at all. Everybody on the metro got up and moved as far away from him as they could until he was the sole occupant of his end of the train.

I felt extremely sorry for the man. I also couldn't blame the people moving away as the smell was so bad.

I think non-homeless people in general just don't know how to respond to homeless people. I'm no exception. But I really don't think "hatred" for the homeless is any more prevalent in Silicon Valley than elsewhere; San Francisco simply has an unusually prominent homeless population.