Every country is en led to elect a moron as president. The thing is that in a country like Argentina the president only gets to his own country; when you are the most powerful nation on the planet, your president gets to the entire world. That's why people outside the US dislike American presidents in general. And then there are the more "personal" reasons each country may have (In Argentina's case, among other things, the US goverment sponsored a military coup in the 70's that kidnapped and killed 30.000 people).
Obviously, having someone like Bush doesn't help either.
This sentiment is not against everything and everybody in the US. But he's the president, it can't get more symbolic than that.
Sometimes I feel that the ignorance about the (real) world that is often associated with Americans carries a great deal of innocence, like they don't know the effects their country/goverment have on other countrys. The other day I was talking with this exchange student from New York (law school) and she told me that she was surprised of how present the US is on our everyday lives. It's not like we can forget about it.
Saludos.