Hanna, I don't say, that rude people is majority in Russia, quite opposite. Ordinary people can be very nice. You can make as many good friends as you wish.
But you will encounter unprovoked aggression, sooner or later.
There is certain percent (approaching 100% among men in power), that will do whatever to harm you, even without any advantage to themselves. Something to do with genes (and permanent drinking), I guess.

I can't compare my region to any other place except Czech, and couple others regions in Russia.
And comparison is not in favor of Russia. Czechs are more patient and benevolent to each other (let's don't speak of foreigners).
Russians are noticeably wilder.
I think Belorussians are closer to Czechs in this matter (solely from rumors, and from couple of Belorussians that I came across).
So speaking of that little percent of unpleasant people:
-Too agitated and harsh people are in Omsk.
-Calm and unforgiving people are living in Moscow.