I have no clue what problem with intolerance you have. People treat BRs badly because BRs behave like shit themselves. Its simple cause and effect. Has nothing to do with intolerance. Its the only community I see spam death threads constantly and repeating stupid as fuck arguments without being able to think for themselves or see how incredibly biased and unlogical their arguments are. And they come in masses.
Its very natural that people get annoyed by such behaviour and start acting negatively in return to brazilians.
Also, the reason why people seem to blame 'all brazilians', is because online it seems like 90% of them are actually behaving badly. I hardly ever see 'good brazilians' denounce the bahaviour of the 'bad' ones. And even if you do see it, its only a small percentage. As long as the majority of the Brazilians (assuming those are good people) would take a stand against the vocal horribly uncivilized minority, we wouldn't have this problem of 'intolerance against all brazilians'.