Don't conflate US stock market volatility with a unilateral opinion that China is winning.
China has PLENTY of major problems. The EU filed a huge Intellectual Property Case against them in 2018 with the WTO. The US Treasury has filed a currency manipulation case against them with the IMF.
It is an essential truth that if you run a $600 B annual trade surplus with one nation - at the end of it all there can be only one winner and it isn't the nation with the surplus. Things seem crazy in the US stock market at the moment but there is no doubt that the Chinese manufacturers aren't pleased either. My guess is that US farmers and Chinese manufacturers privately are both quite anxious.
It is a known fact that the US government is privately steering US Companies to alternative low labor cost manufacturing outside of China. Silicon Valley has stopped taking Chinese Venture Capital 'cold turkey' - WSJ has had several excellent pieces about it. Vietnam, Mexico, India, Korea, and Indonesia are quite aggressively undermining Chinese reliability with their Western export customers. Google "Vietnam GDP Manufacturing". The Vietnamese government has very coyly opened up a special government office in 2018 to oversee foreign intellectual and property rights.
And strong civil unrest in Hong Kong is setting up Beijing for a confrontation that could conceivably lead to Tienanmen Part Deux which would destroy China's economy and shred their international standing. I'm not saying that it's probable, but it is a very tenuous situation. The fact that the Chinese Communist Party released a statement yesterday that their "patience was reaching a limit" was heavy and militaristic. It only inflamed the Hong Kong citizens and reinforced their beliefs about the CCP.