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I have seen this happen and perhaps comes from the idea of "para inglês ver"! However, once the party or vacation is over, this is not the case for foreigners who choose to live in Brazil - this is my situation :).

As a said before, Brazil, although a country of immigrants, does not have the experience of modern day or mass immigration, hence these diverse reactions to people who are different.

Actually, I think that we simply consider foreigners living in our own country being somebody interesting, because it's a tough decision to leave home and start that type of challenge.