I don't know about that. I've spent about 6 months there over the course of several trips. Brazil is more of a beach culture (far inlanders excluded) than just about anywhere in the world. They've had a surf culture there for a very long time.
As for the stereotypical Brazzo in Indo/Hawaii/etc everyone loves to hate, I think that's more a function of them coming from a high enough upper class to afford being able to travel the world with a crap currency. With that kind of money in a country with that high of wealth inequality, you can basically walk all over people and they will still wash your feet afterwards. There is also an intensity to the culture that comes from living in such a high crime city like Rio.
Like brukuns pointed out, your working class Brazzos surfer tend to be more polite.
This is one of the better takes I've heard here.
Most Brazilians I know that travel frequently or emigrate come from upper middle class backgrounds that afford them the security to do so.
The "it's in one's DNA" take is bullshit. It's in your socialization. You learn how to act from the people around you.