it is a mark of brainwashing, the reduction of reason and the increase of the animus/anima. brainwashing implants false equations in the mind that render it impossible to think about those subjects. psychopaths inflict this on people, and the victims also inflict it on each other (i call this Chain in the Manipulation Protocol).
they just call anyone in the out-group a nazi. that's how cult brainwashing works. marxism is like a cookie cutter for cults. they are not cults of personality, necessarily, although i think they all pretty much worship Marx, and use his word tricks like a pidgeon on a chessboard, because according to them, only marxists are humans, and if you aren't one of them, you are literally hitler.