I'm not sure if that was an active attack or it's a simple human nature.
In YU, the Marksism was the subject in school, I forgot if it was obligatory in the elementary school but it certainly was in high school and on the first 2 years on faculties. And it was obligatory from the end of WWII until 80's.
Yet... Even after 40 years living in communism, learning in school about communism, how good it is, it all collapsed once it was possible to drive a Mercedes and not Lada. And when it became possible to wear Lewis 501 and not the same thing produced locally.
Once the people are not in imminent threat - they tend to form hierarchies, not the equality.