I haven't run into many (I have about 300 hours played). There were only 2 or so that were unfriendly. I turned off voice chat a while ago though, that was due to me playing together with my brother and using mumble instead of the built-in chat. Although there was an idiot in mumble that was trying to mess with us while we were playing. I think it has to do more with he voice chat rather than the actual game.