Even Olympics officials have said the conduct of the Brazilian fans is unacceptable. If you're not just trolling you can search out some quotes yourself.
I find it quite disturbing accusing Brazilians of "booing" at sports event when you could and can see this in events such as US Open, Wimbledon and other "clean and gentlemany" sports when the opponent is from some other country than US or UK. Let's not get into more "dirtier" sports now where booing is de facto standard.
What exactly do you want to see from me that you can't find yourself?