China has turned up the trolling. When Donald Trump announced his April 2 “liberation day” tariffs singling out China, Communist Party propagandists responded with AI-generated movie clips of the US president and JD Vance, his vice-president, wearily stitching hats and putting together electronics in sweatshops. China was goading the United States, saying: “This is the dirty work we do for you – are you sure you want to do it instead?”