I suppose the elephant in the room is whether or not 'techies' are repulsed by the homeless because accusations like "...[they] spit, urinate, taunt you, sell drugs, get rowdy..." have a basis in reality. I don't live in SF, so I can only go off what I hear (from the accused 'techies', so I'm only getting one side of the propaganda here..), but what I have heard is that 1) the homeless really seem to love SF, preferr…
Add "verbal and sexual harassment of women in the street" to that list.
I can't speak to whether these sort of incidents get an exaggerated or unfair amount of coverage, or if these really are common problems. Of course either way, these sort of incidents/articles surely shape public perception; I don't think we can make this as simple as "Techies are nouveau riche who like to kick 'em when they're down".