It's a variation on an old Argentinian joke: 'When the New World was colonized, the Argentinians came from boats and the Brazilians came down the trees'.
No surprise here; this is just what I'd expect from most Argentinians(after all, quoting from a Brazilian joke, 'The best deal in the world is buying an Argentinian for what he's worth and selling him for what he thinks it's worth').
I think that since the Pope said two weeks ago there was 'too much moonshine and too little prayer' in Brazil, he supposed it was OK to shit on Brazilians as well. Note that Fernández, and Argentina, are in trouble: high inflation(even when looking at the official rate) and an economical crisis that has endured two presidents already(Fernández's puppet master - Christina Kirchener - started the crisis, Mauricio Macri failed to solve it and made it worse, paving the way for Fernández, who is also failing to solve it and is making things worse).