Perhaps you are mistaking people's expression of knowing things about reality, for an expression of knowing things about China.
It's OK for people to know things about reality. You shouldn't get offended by that.
How about an example.
Reality: Striving for safety is a good thing to do when developing a space program.
China: We strive for safety, but our situation is special and outsiders who criticize our safety don't understand our situation. We have safety, but we call it "safety with Chinese characteristics."
Here is an example of safety with Chinese characteristics. You see the rocket explode, just as western rockets often do as well. What is different is how the rocket is allowed to launch near a populated area, and how instead of having a self-destruct mechanism on failure, it is allowed to continue straight down into an area filled with houses. (Previously filled with houses, that is. Not anymore).
https://www.youtube.com/watch?v=FBJ9ue6GKek
Again, the Chinese government would call this safety with Chinese characteristics ("x with Chinese characteristics" is their term, not mine). But that doesn't make this disregard of human life right. One doesn't have to be Chinese to understand that. One only has to be human. We non-Chinese humans also have thousands of years of history, you do realize that right?
So people can know it to be true whether they've been to China or not. Apparently, the Chinese government rocket scientists, who should be pretty smart Chinese people who even come from the culture that invented rockets long before anyone else, do not know as much as that.