Keep in mind this is China clapping back at senior US administrations forwarding the Wuhan bioweapon theory and Pompeo insisting on referring to the virus as the "Wuhan / Chinese" virus in public statements. This is a dangerous (though not random) escalation. New generations of Chinese diplomats is embracing Trumpian style of propaganda, it's is a large deviation from their traditional messaging. People keep conveniently ignoring that the current US administration set the tenor for the Chinese confrontation and other diplomatic relationships. They'll condemn the lies, tone and disrespect when current admin deals with allies, but embrace it when it comes to China - and are surprised that like US allies, China will eventually assert themselves. At the end of the day, US sentiments is determined by US propaganda, China was never going to win Americans over. This display is for domestic Chinese audiences and seed doubt in other countries.

E: I don't agree with the new direction, but it's something different and not entirely unexpected after 4 years of aggressive US propaganda, things will only get worse unless Pompeo and Trump deescalates. Politiburo has ran out of patience like many US allies, except China is large enough that they can afford to speak their mind and retaliate rhetoric in kind. Keep in mind TPP and Pivot to Asia under Obama was explicitly designed to target China, but anti-Chinese sentiments and nationalism (on both sides) never got out of hand until Trump decided to weaponize it.