Never offer Chinese men green hats as a gift. The expression “wearing a green hat” means your wife is cheating on you. It’s humiliating and a huge culture taboo. It is said that in Yuan dynasty (13th–14th century), the relatives of prostitutes were forced to wear green hats.
Another color myth is YELLOW, associated with pornography in China. In Chinese, “yellow books” refer to pornographic pictures or graphics, “yellow movies” refer to pornographic films. A specific Chinese word “扫黄 (sao huang)”, which literally means « sweep yellow », refers to the campaign against prostitution. Its origins seem to be tied to Fengshui: yellow is the color of earth in China, and the earth is the symbol of fertility …
https://www.linkedin.com/posts/luxuefei_linkedin-china-culture-activity-6709020602520350720-IJTc