This is ill-informed and easily proven wrong.
I'm no China apologist, but the Chinese have suffered the worst human disasters in history.
Let's go down the list of top 10 anthropogenic disasters by geometric mean death toll and count the causalities in China [1]:
1. 2nd World War estimated 70 million dead, 17.5 million dead in China [2]
2. Three Kingdom War 38 million dead, all Chinese
3. Mongol Conquests 35 million dead and transition from Song to Yuan. Chinese population registers drop from 140 million to 70 million. [3]
4. European Colonization of the Americas 35 million dead, no Chinese dead
5. Taiping Rebellion 35 million dead, all Chinese
6 Red Eyebrows Rebellion 30 million dead, all Chinese
7. Muslim conquest of India 41 million dead, no Chinese
8. Ming Conquest of Yuan 30 million dead, all Chinese
9. Qing conquest of Ming 25 million dead, all Chinese
10. Second Sino-Japanese War 22 million dead, mostly Chinese
and as a bonus:
11. An Lushan Rebellion 21 million dead, all Chinese
Let's count the bodies.
Total dead in 11 conflicts: about 380 million dead
Chinese dead: about 200-220 million dead.
The Chinese are in a whole other ball park in terms of historical suffering. Nothing in American history compares to even a civil war most Americans have never heard of, like the An Lushan rebellion. For perspective, "only" 700,000 American soldiers died in the US Civil War and there were no accounts of civilian casualties of similar magnitude.
[1] https://en.wikipedia.org/wiki/List_of_wars_and_anthropogenic...
[2] https://en.wikipedia.org/wiki/World_War_II_casualties#Total_...