I can assure you that Argentines don't hate North Americans in general! If an Argentine treats you bad, is because you have been rude or behaved in an inappropriate manner. I have been living in Argentina more than 10 years, and I cannot believe that the Argentines like the British. Argentina went to war with the UK over the Falklands, but you cannot find any Argentines that talk bad about the British. North Americans tend to be very arrogant. On several occasions I have been shopping and cross North Americans and it seems that they get upset when Argentines don't understand English. Argentines cannot understand why a North American would want to live here, because most of them are trying to get to the USA. Really you should just get over it, no one hates you unless you are bad. Enjoy your stay in Argentina.
Mike
Mike