Comment by pyrale
I believe the point GP makes is not that China is a good place. More like that we are oblivious to all the points that make our own place pretty bad too.
On one hand, you can claim that it's a well-known propaganda technique (e.g. the soviets using "...And you are lynching negroes" as a rebuttal to anything). But on the other hand, the most satisfying way to avoid that form of propaganda would probably be to fix our own flaws rather than calling whataboutism.
I mean American's seem like about the most 'bring our flaws out into public and deal with them' society I have ever interacted with. Daterape is no longer acceptable. The entire way men treat women has changed in my lifetime. How we respond to domestic violence has completely changed (we don't just ignore it). LGBT+ rights have greatly changed. Race relations have completely changed (they may need work but they are so much better than the 80s where people rampantantly used the N word at work, in social situations).
The average American is much more aware of our issues, not China's. Our own place isn't pretty bad just because we have past history nor ongoing problems. It's a matter of 'what are we doing to change and improve', and are we willing/free to bring up problems that need changing, and does our societies structure allow change? Or does society pound down those nails that dare stick out? Every society is a flawed human constructed stumbled into not intelligently/humanely designed. The American systems is the most dynamic/flexible of all the ones I have been exposed to. There are more liberal ones, but less dynamic and flexible (no free speech laws in the UK which might cause the lack of reflection that you lament). There are more conservative ones that are again less dynamic/flexible.