What does it mean to sing about the moon mocking the wind?

Pinyin:

Lady Yang

Explanation:

Refers to the words that describe scenes such as wind, clouds and moon dew, and have poor ideological content.

Source:

Tang Bai Juyi's poem "Send my brother Wei Cun first": "It is also appropriate to descend to Yue Bai first and climb mountains near the water."

Example: