Why are Russians so rude?

I'm not trying to put Russians down or anything but I live in a area where it's culturally diverse and i've noticed that most Russians are VERY condescending- why?? My neighbor says that it's probably because of they hardships they faced in Russian or perhaps their parents or grandparents went through hell, developed those characteristics and have trickled down to their family. Is this true? Or it possible that they have some sort of ego? what is it? Why do have to be so hostile? I've encountered this not only at school but at work, out in the street, stores...why do they have to be so rude?