No problem, bud. They have 1.4 billion people and a mixed economy with a large, decades-long poltical program of intense economic development.
That many people going from agricultural poverty to high tech manufacturing in a 50 year span means it will eventually overtake US gdp.
However the average person in China is still quite poor by currect US standards. US GDP per capita is 83k, while China's GDP per capita is 12k. So if you're argument is that tarrifs are good because look how great China's citizens are faring, that's going to be a weak argument.
Finally, they have the most diversified economy in the world and manufacture goods for every corner of the world. Tarrifs on imports mean very little to China because they domestically manufacture so much. It's basically a luxury tax for them. The 12% share they export to the US is important but they are not utterly dependent upon it.