What % of Americans could even tell you the names of the last 3 dynasties?
What percent of Chinese could name the first 3 American Presidents? Who cares and how does that have anything to do with the modern political climate? The average American does not need to be aware of the country's history to disagree with the actions and posturing of the current government.
But for what it's worth, the average educated Chinese knows far more about America than vice-versa. These threads are great evidence.
Flip it around with gun control.. The rest of the world by-and-large does not agree with American gun policy. But how seriously are Americans going to take the criticism of people who don't have an understanding of American revolutionary history? If you actually care about effecting change you definitely need to understand the context.
History is meant to be studied so that we do not repeat past mistakes. It is not meant to be used an excuse to continue to make them.
Also, you absolutely do not need to be versed in Chinese history to disagree with forced organ harvesting, forced abortion, "re-education" (read internment) camps for Muslims, mass government surveillance, social credit systems, etc.