Hum.... I do not agree at all with that statement, because I know many very successful and wealthy people. They are no more "rude" than the homeless guy begging for money on the street.
I will say, that they have no tolerance for stupidity or time wasting games, but I see nothing wrong with that.
They are rude cause they want to show to people that how powerful they are. However, most of those people are lonely inside of their heart. They won't show it outside. But inside of their heart is lonely even tho u see that person have alot friends. How do i know? cause i knew some sucessful people, so i had experience that.