Not mentioning US problems every time they criticize CCP problems is not automatically hypocrisy, and this idea basically means you cannot criticize anything without criticizing everything someone considers just as bad or worse at the same time.
Calling a discussion on China hypocritical because it doesn't say "but US worse" is essentially trying to build in whataboutism into every discussion.
It's a symptom of increasing polarization and part of the problem.
That's the hypocrisy: not seeing the block of wood in the eye of one while complaining about the speck of wood in the eye of the other.
By trying to be less hypocritical we create a more level playing field based on facts, instead of gut-feeling based hatred.
Whatabboutism is, IMHO, used a lot as a way to circumvent having to address the glaring hypocrisy: i see it's used to shut up those to point out hypocrisy.