What are the characteristics of Bai Juyi's poems in Tang Dynasty? Why are they called poetic demons?

The origin of Bai Juyi's title of "poet's demon" is just as he said in his poem: "The demon sucks the poet's hair wildly and mourns until the rest of the day at noon." He repeatedly read his own poems, making his mouth sore, and that's how he got the title of poet demon. Most of Bai Juyi's poems are selected from his own side, and his poems are easy to understand. His words mainly express his sincere feelings in the language closest to life ... He never participates in intra-party wars and is indifferent to fame and fortune. Committed to the interests of the people. His feelings are an example for us to learn, and his poems are classics in history and Chinese civilization that has spread for thousands of years.