I think they are forward looking and many do not want to talk about the past. They aren't dumb. Many of them are aware of Tianammen square and other things. Many of thr wealthier and more educated Chinese have VPN and access to outside information. Facebook, Google, things that are normally restricted by the Great Firewall of China. Tons of Chinese tourists vacation outside the country. The communist regime was brutal under Mao. It has softened significantly from a socioeconomic standpoint despite regional inequalities and people are optimistic despite the political authoritarianism. Life has gotten 1000x better in a single generation.
I imagine you telling the Chinese student to liberate their mind was met w the same incredulousness and eye rolling as if someone told you to liberate your mind about institutional racism, slavery, massacres of american Indians, political meddling in latin America, recreational drug use, obesity, and gun violence in America. A shrug of the shoulder and maybe asking self why some wacko would bring up random topics that you can't really do mich about. The Chinese are often quiet socially and hold their tongue. But I can imagine an outspoken one would retort by telling you to get your own house in order before being critical of others