Well considering most servers now a days are (approximately - rough figures) 60-40% Brazilian and Philippine players to rest of the world, I tend to see alot of players cursing, rule abusing and generally being annoying. But of course we cannot just single them out as the "bad players" and simply IP ban the whole lot of them.
Judging them by their stereotypical behaviors, no offense - makes you almost as bad as they are. Think about it just for a moment, they see you as another player who "hates" them, and inturn - "curse you out" which, naturally, causes you to retaliate with other profanity.
You (Directed at nobody, using it in the first person [Read above]) see them as a Brazilian/Philippine player who is obviously about to do something wrong, so as soon as they make a minuscule mistake, they are immediately reported to the closest Game Master, Administrator or equivalent.
I am in noway saying that everybody is this way, just using it as a small example , and being Game Master myself - I get numerous reports about this kind of thing happening. Most of the time I just hand out warnings since they are normally small things - but I believe that no matter where they are from, all players should get the same punishment whatever it may be.
In no way should anybody be refused service from a server just because of where they are from. If you cannot escape prejudices on an online game, where can you?