Whichever they wish really .....or they could request/force/leverage their companies to insert back doors into smart devices for espionage, censoring, or even sabotage. Alternately, they could further extend their use of so-called "sharp" power. For examples of sharp power they've used already: look to how they've been reacting to airlines who recognize Taiwan -- or the incident where a US-based Marriott employee (Roy Jones) was fired because he unwittingly "liked" a social media posting (on behalf of Marriott) that happened to irritate the Chinese government.
Perhaps some of it's not intended in animus, but given how much of the behavior has continued even after official complaints have been lodged/expressed it's not exactly playing nice. Though when it comes to the currency manipulation they've been doing, it's effectively about the same a putting tariffs on all imports from the US. So as far as I'm concerned, the turn about of explicitly placing identified tariffs on their exports to the US is nothing more than leveling the competitive playing field a little.
Bottom line for me is that if they need to tip the scales of the free market (through subsidies) to be competitive, then it's fair play to level them back out with tariffs - otherwise they may very well be able to do with economics what the Japanese and Germans were unable to do through force in WWII (devastate the US industry and markets). Whatever their reasons, I'd rather not find out to what extent they would leverage such influence given their stance on many basic human rights.