Trotsplaining
When a young and eager but inexperienced comrade condescendingly talks down to a person in the process of trying to persuade him or her of the principles and merits of scientific socialism, thereby ignoring Lenin's instruction to "patiently explain" and needlessly alienating said person.
Comrade, you should have known better than to tell the head of the feminist student association that Lena Dunham is a petty bourgeois shrew. That this is true is beside the point. Such trotsplaining does nothing to advance the interests of the world proletariat.