This just isn't true. China has not played fairly against the US in modern history. Putting aside problems like currency manipulation, intellectual property theft, and putting up barriers for foreign companies, they also haven't played fair with regards to tariffs.
Take Elon Musk's word for it if you don't believe me: "an American car going to China pays 25% import duty, but a Chinese car coming to the US only pays 2.5%, a tenfold difference"
https://www.cnbc.com/2018/03/08/elon-musk-sides-with-trump-o...