Yes, Chinese are known for their 'whataboutism' and 'can't help it' mentality. It will take at least a generation before this mentality will change.
If there is no objective evaluation of actions then all that left is the capture of the subject of discussion.
By this way one country can keep the discussion about someone blowing up a building and few thousand civilian, and rejecting any trial to direct the discussion to his bombing and killing few million civilian.
"whataboutism" is nothing else just a trial by the attacker to keep the initiative in the discussion, and keep away the topic from the non convenient areas.
Say, an average US citizen has three hours of time for international politics.
If you can fill up this time with "russian meddling in elections" , "Chinese aggression over the South Chinese sea ", "Russia invading Ukraine " ,"North Korea prepare to attack the US", "Russia killing innocents in Syria " , "Iran support ISIS " and the line is infinite.
If you can fill up the time of your citizens with this topics, then you don't have to worry about that they can develop informed/objective view about world events.
The above is the reason that developed the need of independent judiciary.
However this doesn't exist in the international politics, on that field all that dominate is the "stronger get it all" .
Means it is always OK to drop nuclear bombs onto cities, fire bomb and kill 100 000 civil , or kill millions of civilians by starvation or terror bombing IF you win the war.
Everything afterwards is only "whataboutism"
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It will change, in ten years of time the USA will practice the art of "whataboutism" : )