Propaganda will do that. I've never met a single communist who denied that there was a major famine in China. The problem is that liberals seem to think Mao invented famine, when in fact China was experiencing famines every 2 to 4 years for over a century by the time the communists came to power. They had a theory for how to address the cycle of famines and increase food surplus, and their theory failed. But liberals think that Mao deliberately killed millions of people because he was an evil dictator instead of acknowledging the reality that Mao was leader of a massive government and they all failed as an organization by producing the conditions for famine. The context is also lost that eventually the Chinese revolution did end the cycle of famines permanently, and they were trying to solve it without any help from Western agriculture because the West was too busy protecting the fascist dictator that was holed up in Taiwan who was actively mass murdering and imprisoning political dissidents.
The Holodomor is another one of those things propaganda skews and breaks our ability to agree to a shared reality on. I have never met a single communist that denies that there was a famine and that many people died. What they often cite, which liberals can't reconcile, is that the famine affected many more populations than just the people who were supposedly targeted and that research into the incident shows that the crop yield was severely negatively impacted by weather and made worse by not just bad decision making but also bad decision making that was in part driven by punitive thinking. The famine happened, but propaganda would have us believe that the famine was unquestionably a deliberate attempt at ethnic cleansing or genocide, when the evidence seems to be far more in support of a natural famine made worse by poor management with an added dose of maliciousness that ultimately rolls up to bad management.
In contrast, you don't seem to have any problem with most Westerners having never even heard of the famines that were in fact deliberately caused by the West and for which the only explanation is the active choice of making a colonized population suffer.