Knowing the argentinians very well, they're our neighbours, i wouldn't say the population is racist, many of them are, like any country.
Their football environment is another history.
In the case of some of their players, fans and journalists, something happen that is very hard to explain to europeans. Many times they will say or do things that are obvioulsly racist to us, but they apparently are not aware of how serious things are. And is not like if the person is really racist on his/her normal life. For example, when they talk about races and nationalities, they dont see it as a big deal. In general they will insult everybody, from germans to africans. Is not because some specific race.