[paraditedc]

People know things are being censored, well, as least of my age.

There is a term and a meme for it on Chinese internet. You can Google-translate these pages that explain the term:

https://zhidao.baidu.com/question/1882528841530933188.html

https://baike.baidu.com/item/%E6%B2%B3%E8%9F%B9/10292878

[graeme]

That was a more extreme example. I expect most Chinese online know of censorship. But do you/they know about the government caused famine under Mao?

[paraditedc]

As far as I recall, everything else that is negative, except 1989, was taught in secondary school history class.

[becege90]

This is a censored answer /explanation of the term.