How to distinguish between cultural backwardness and decadent culture?

Cultural Lag: All kinds of superstitious, ignorant, decadent and vulgar cultures are in the form of traditional customs, such as fortune telling, word reading and geomantic omen. Cultural lag is a kind of cultural dross, which needs to be reformed and eliminated through scientific and cultural education.

Decadent culture: it corrodes people's spiritual world, erodes national spirit, hinders the development of advanced productive forces and harms the socialist cause. We must resolutely resist it and ban it according to law.