Sorry to crush your idea of 50 ping, Brazil has easy 170-200 ping for the rest of South America, it is much better EastUS 90-110, and even WestUSIts not great.
You should be able to block servers or block certain nationalities. Playing vs any South americans right now is a massive disadvantage (50 ping vs 400). Impossible to micro vs etc. The game is completely different when its not played on Brazil server