I'm not sure a boycott will be needed. As the US economy shrinks, and as consumers in the USA stop spending, Chinese factories will quickly feel that pinch and squeeze. AS the the shrinking US economy impacts other economies, so too will the Chinese economy contract, except that it will be multiplied many times over.
Isn't it true that as economies contract it is those economies that are on the lowest end of the scale (producing the most junk at lowest price) that feel the impact the most?