Its not black & white. Every big city has a lot of hostility on the street due to bad drivers, dog shit, rude pedestrians, and all the other crap. I don't think people in Bs. As. are worse than what I dealt with living in Boston or D.C., or visiting NYC, London, and a bunch of others. Argentians are cynical and frustrated with their decaying country and culture, they hate nearly all politicians, they hate US and Eureopean foreign policy, they hate the multinationals that strip out the natural resources and send them north.
On the other hand, as Stafford said, most of these people are much more pleasant in social situations. And people outside of the province are much more relaxed and outgoing. I have many examples of how kind and generous people with are with strangers outside of the capital. Most recently, when the waitress at a hotel I was staying at in Corrientes found out I was in town looking for a house to rent she insisted that I speak to her husband. Enrique isn't a real estate agent, nor does he own any houses up there, but he spent several hours helping me to look at places and negotiate a deal with the agent for the place I settled on. He saved me 500 pesos per month by getting rid of the gringo tax! He insisted that I pay him nothing, and wants to pick me and the family up at the airport when we return.