The US Congress has adopted a law to openly encourage contact with officials of ally Taiwan. China thinks the US has no right to do this.

In the 1970s, China was a valuable ally against the Soviet Union. Now that China is powerful, it tries to bully other countries about this, while beginning military expansion in the South China Sea. At the same time, it is becoming ever more oppressive. I think it is good to show tyrant Xi that there are limits to how much he can get other countries to kowtow.