Xu Xiaodong

Xu was sued in 2019 for calling tai chi "grandmaster" Chen Xiaowang a fraud, and the Chinese court ordered him to pay Chen approximately US $60,000 in damages and to apologize for seven consecutive days on social media. Additionally, his social credit rating was lowered to the point where he could not rent, own property, stay in certain hotels, travel on high speed rail or buy plane tickets. The restrictions were lifted after he paid US $40,000 in both legal fees and the cost of placing the apology.

In May 2019, Xu defeated another martial artist; but was only able to do so wearing clown makeup to hide his face and by fighting under a pseudonym. It took him 36 hours to reach the fight location due to his low social credit score, and Chinese search engines reportedly had stopped listing him. Later that year, Xu had to wear Peking Opera face paint and cover his back tattoo during his match with Japanese kickboxer Yuichiro Nagashima so that the fight which took place in Japan could stream in China. By defeating Nagashima, Xu believed that he could pressure Yi Long, whom Xu has claimed has rigged competitions, to face him in a match. Yi Long has previously criticized Xu, as well for his attitude and claiming that Xu himself is in fact a fraud.

In November 2019 an Iron Palm master threatened to break his arm in a fight, but apologized and backed down after Xu accepted and suggested putting 200,000 yuan on the outcome.

In August 2019, Xu spoke out on Twitter, Sina Weibo and YouTube questioning the government's reporting of the Hong Kong protests, stating that the Chinese government was running a "smear campaign", and met with human rights lawyer Chen Qiushi who had shared similar views. Xu has also clarified on his YouTube account that his statements were about how the mainland government should adhere to the One China, Two Systems policy as promised, rather than a call for Hong Kong independence. He was subsequently visited by Chinese authorities and had his Sina Weibo account wiped for the eighth time.

Xu was frustrated by what he saw as fraud and hypocrisy amongst martial arts practitioners, and wanted to demonstrate the superiority of modern fighting styles. Many in China believe that kung fu masters have supernatural powers, and self-described masters, including Wei Lei, were known to make such claims online. Xu started a dispute with Wei on social media, beginning with a demand that Wei provide evidence of his abilities, and culminating in a bare-knuckle fight in a basement in Chengdu in 2017; Xu won convincingly in less than 20 seconds.

Xu has also come to the defense of Fang Fang, a Chinese author living in Wuhan who published the Wuhan Diary which related the experiences of people living under lock down in the city by the Chinese government. Fang Fang received widespread criticism from Chinese nationalists, including Tai Chi practitioner Wei Lei, who was defeated by Xu in 2017. Wei called for martial artists in Wuhan to assault Fang for her work while Xu defended the author who he claims was mild in criticism and was being truthful in her accounts.

Xu has run a YouTube channel called Brother Dong's Hot Takes [zh] since 2015, consisting of 45 minutes long sports show style monologues, largely about MMA and his own experiences. He records the show in Beijing, and sends it to a friend in America to upload it. Most of his audience are from Hong Kong, Taiwan, or are Chinese firewall jumpers.

In 2001, Xu began training for mixed martial arts (MMA) and Muay Thai. He was drawn to the fighting style because of how free it was. A year later, he founded the first MMA team in Beijing and organised China's first MMA tournament. He has been called the founder of MMA in China.

Xu Xiaodong (Chinese: 徐晓冬 ; born 15 November 1979), nicknamed "Mad Dog", is a Chinese mixed martial artist (MMA) who has been called the founder of MMA in China and is known for taking down fake martial artists. He gained prominence online after he was filmed defeating self-proclaimed tai chi master Wei Lei in 2017.

Xu was born on 15 November 1979 in Beijing. In 1996, he entered Beijing Shichahai Sports School [zh] , where he was trained in sanshou and boxing under Mei Huizhi (梅惠志) and Zhang Xingzheng (张兴正). He competed at least twice at the Beijing Sanshou Invitational Tournament, finishing as the champion and the first runner-up, respectively. He became a sanshou coach at Shichahai School after graduation.