You are making
stupid assumptions -
a) the movie (one of the best Brazilian films to date) was a portrayal of 70's drug culture in Rio
b) whether you go to Brazil or not is your choice, however you will be hard-pressed to find another country where Americans are more liked or better treated.
c) although there parts of Rio and Sao Paulo that are dangerous and should be avoided (i.e. the "favelas" - slums/shantytowns), saying that people should avoid the country is like saying that tourists should avoid the US because of Compton, Watts, the Bronx, downtown Detroit, Chicago, or Denver, N. Las Vegas, D.C., etc., etc.
d) saying that Brazilians can't shoot for crap because of what you saw in a movie, is just as absurd as foreigners who think that ALL American women are blond and silicon enhanced.
I lived there for 4.5 years, so what do I know.
YMMV
ETA for poor choice in words