Hey, whoa there, most Russians are sane... most of the time. But so as everybody else.CS:GO proofed me otherwise.

If you speak English you are an "American whore", they never use Skype or TS and spam the voice chat, they barely speak English and rage fast. They come in groups so you can´t kick them. And if they speak English it´s like this: https://www.youtube.com/watch?v=RqaCWiUB-i8
Last conversation went like this:
Me: Hi. I´ll go A long.
Russian teammate: сука американцы
Me: Sorry, I can´t speak Russian. Can you speak English?
Russian teammate: Fuck you, nuub.
From anecdotal experience I can tell you in about half the cases a communication is impossible or rather not wanted. And that in a team based game. Doesn´t apply to all of them but this is an often discussed problem in the CSGO community.