Both oldschool and neo marxists are retarded in their own way.
Old school marxists deny that history comes in cycles, not a linear line with incremental improvements or "progress."
New marxists are simply worse than the new marxists at hiding the fact that they hate their parents and simply want to burn their society down, for reasons.
Both play into the hands of scheming authoritarians and capitalists, new marxists are more willfully blind to their "useful idiot" status.
All in all, there's a reason why communism attracts mainly upper class midwits and lupenproles, even though Marx claimed to hate both.