Well, I'm BR and i don't think that I'm one of that stupid BRs which peoples say.
I rarely speak portuguese in chats that are not party or pm (or guild sometimes).
Yes, BRs destroy the game (I can't say about the Vietnam because i don't know any of them).
But no, i would'nt change my char to BR server because i hate playing with BRs except my close friends that are less than 5 BRs.