Best known as the Chinese Dondozo copypasta its actually an insult or hate towards players who play Dondozo in competitive Pokemon.
常年玩dondozo的人大都目光呆滞，极度自卑，且智商逐年下降，最后完全沦为傻子。玩dondozo会破坏身体结构，引发各种不治之症。人一旦开始玩dondozo就说明这个人的智慧品行样貌通通都是下等，这辈子只能在阴沟里苟延残喘。玩dondozo的玩家具有强烈的反社会倾向，对治安稳定造成破坏危害正常人的生命。Translated to EN
Most people who play dondozo all year round have dull eyes, extremely low self-esteem, and their IQs decrease year by year, and finally become complete fools. Playing dondozo can damage the body structure and cause various incurable diseases. Once a person starts playing dondozo, it means that his intelligence, conduct, and appearance are all inferior, and he can only live in the gutter for the rest of his life. Players who play dondozo have strong anti-social tendencies, causing damage to public security and stability and endangering the lives of normal people.