What ideas in traditional Confucian culture can still be respected in the contemporary era? What can be discarded as dross?

Respect, cultivate one's morality. Respect elders, be filial to parents, have ideals, attach importance to knowledge and be good at learning. Loyal to the upper level, clear to the lower level. Pay attention to the revision of history to learn from the present, pay attention to the knowledge of things and so on. It is not a bad thing to teach people to be gentlemen at any time.

Dregs, the distinction between China and foreign countries (looking down on foreign countries), attaching importance to officials and neglecting business, class thought (Confucianism first classified people, which is also related to the social environment of the Zhou Dynasty), extreme loyalty to the monarch and filial piety (the monarch will die if he wants to be a minister), men are superior to women and so on.