The culture shock between Russia and North America is real. I intend to work there as soon as I can get my passport together and the right contract available and 50/50 when I tell people this they freak out and act like I'm going to be immediately thrown in jail and/or murdered.
Regarding the bit I quoted: As I understand, Russians who move to or study in North America have a difficult time adjusting and making friends (amongst other things). Others find them abrasive because their culture is such that, if they want you to respect them and vice-versa, they tell you exactly what their opinion is without regards to your feelings (infamously, they seem to be fans of telling people if they think they are fat). They are also not fans of smiling at strangers and displaying forced optimism.
I don't know if you guys missed it, but reading about Kucherov's comments last offseason might be illuminating. He criticized, without naming, certain teammates who, and I'm paraphrasing here, "got their money and stopped playing hard." We assumed he was talking about Alex Killorn due to the sizable contract he got (relative to his regular season performance).
Also, here is a wiki page for that word. You pretty much nailed it:
жёстко - Wiktionary