All of their arguments are bad and tautological.
Mozi, roughly 300 BCE [Mozi, philosopher, served as a minister in the State of Song, Mozi (the book has the same name as the guy), Book 9, “Anti-Confucianism II”, verses 4-5, no one knows exactly when it was written, English translation: W. P. Mei, https://ctext.org/mozi/anti-confucianism-ii, //zrubin]
儒者曰：「君子必服古言然後仁。」應之曰：「所謂古之言服1者，皆嘗新矣，而古人言之，2服之，則非3君子也。然則必服非君子之服，言非君子之言，而後仁乎？」
The Confucianist says: "The superior man must be ancient in mode of speech and in dress before be can be magnanimous." We answer him: The so-called ancient speech and dress were all modern once. When the ancients first used that speech and wore that dress they would not be superior men (according to the Confucianists' criteria). Do you therefore mean to say that one has to wear the dress of the non-superior man and speak the speech of the non-superior man before he can be magnanimous?
又曰：「君子循而不作。」應之曰：「古者羿作弓，伃作甲，奚仲作車，巧垂作舟，然則今之鮑函車匠皆君子也，而羿、伃、奚仲、巧垂皆小人邪？且其所循人必或作之，然則其所循皆小人道也？」
Again, the Confucianist says: "The superior man conforms to the old but does not make innovations." We answer him: In antiquity Yi invented the bow, Yu invented armour, Xi Zhong invented vehicles, and Qiao Cui invented boats. Would he say, the tanners, armourers, and carpenters of to-day are all superior men, whereas Yi, Yu, Xi Zhong, and Qiao Cui were all ordinary men? Moreover, some of those whom he follows must have been inventors. Then his instructions are after all the ways of the ordinary men.