know-alls

Moral relativism, cloaked in jargon, was on the march, promoted by the tedious, despicable know-alls of the supposedly educated classes.

道德相对主义，披着各种名义的外衣，踏步前行，经由所谓的知识阶级之中乏味卑劣且自称无所不知的人一路炒作。