Polish: im from polish but i hate play on polish servers (or with other polish players), not all of them but most think they are "pr0" and everybody else are noob even when you kill him ;D
Brazilian: if you dont know their language, ignore them...
Romanian: i meet some "ub3r 5up3r h4x0r5" that died on one skill ;D but most of them are cool guys that allways say gf if they died ;)
other ppl i dont remember - they are neutral, not to much bad and good ppl ;p
fLx:
"kurwa" is special word that some polish ppl can't live witouht using it ;p or they dont know how to discuss without using it