Chinese negotiators tend to shift from guanxi-seeking partner to cut-throat competitor mode when confronted with an unpredictable counter-party.
Chinese negotiations usually follow one of two paths – towards long-term partnership or one-off competition. What’s the difference? You are. If a Chinese counter-party feels that he can do better as a long-term partner, that’s what he’ll go after. If he feels that you won’t honor the terms and obligations of a durable & profitable relationship, he’ll go for your throat.
Chinese institutions are known for their long memories, and well after members of the new administration have forgotten their twitter tirades and decided to “move on and get on with business,” American firms will still face increased scrutiny, hostility, and non-economic barriers.