Maybe is a culture/language thing. Because I am not a native English speaker and I almost never have to speak (only read and write) when we have a video conference I always express myself with few words because I am aware how terrible I sound so I will use a lot of OK,Yes, Sure ...
Yes, those Russians can be quite blunt. I once found a great library maintained by a Russian guy that had zero issues on Github. I created an issue for a feature request and was brushed off with unexpected rudeness. Later I looked at this again and found that he was absolutely correct with his argument and his communication was just very efficient and I am sure he did not mean to be rude.
