Well, actually the country name is written "Brasil" in portuguese, and "Brazil" in english, and "brazilian" translate to "brasileiro". It is a little mixture there! :)
I do wonder if they're really all Brazilian or if they just think the flag is cool. Because it is. One of the coolest there is, in fact. High marks to Canada and South Africa, too.
If I were pretending to come from a different country, I'd choose one of those.