Well, there are Italians and they are my countrymen and women so I defend them from people like you who think that whites cannot exist in Southern America, ok?
According to wikipedia in 2008 the ethnic groups of Brazil were:
43.80% Brown (Multiracial)
Usually whites live in better conditions, I doubt that they emigrate so it's easy that the Brazilians you met where from other ethnic groups.
COMPARE BRAZIL WITH ARGENTINA:
86.4% European (mostly Italian and Spanish)
0.4% Asian and others
1/2 Argentinian is Italian.
I agree that most Mexicans, Peruvians, Bolivians and co. are mestizos or pure indios but it's not the case of Argentina and Brazil.