You know, sometimes it's very hard to judge.
I'm of xUSSR descent, and sometimes when I see a group of chinese colleagues speaking together loudly, it is very weird to me, as soometimes they are so loud that if it was in Russian it would mean that the brawl could start any second. It is hard to judge sometimes.
Even in written communication it is was told to me many times that many Russians, especially those with B1/B2 levels, as well as Jewish people are extremely direct, and it may be perceived as native speakers as rude, although it isn't meant to.