You can't lock China out of the market without diplomatic implications. Even assuming you managed to get a purely private boycott of China together without somehow violating anti-trust law, by the time it started making a serious dent in the market the Chinese government would have started making representations to the US State Department. Where it goes from there is anyone's guess.

(Ironically the other direction prevails in regard to Israel: there are anti-boycott laws! https://www.lrb.co.uk/v40/n14/amjad-iraqi/short-cuts )