I'd like you to familiarise yourself with a legal and societal principle we use in civil law countries:

> de minimis non curat praetor

Which basically means judges are not interested in minor disputes. When you add the USA to the mix, China's actions pale in comparison to the point of being negligible, no point in discussing them given the scale of USA's warmongering, overseas and local crimes. "They never interfered in [...]" is an exaggeration which shows the lack of importance of China's crimes when compared to the USA's, that's all.

The "whataboutism" here isn't a deflection strategy, it shows the hypocrisy and correctly minimises the scale of China's actions in comparison to the hypocrites'.