WW2 may as well have been a thousand years ago for many today (not limited to the US or the West). Others recall China helped many of those involved in the Dolittle Raid get back home, the Rape of Nanjing, and the taking of Chinese territory by Japan. I'd always considered China an ally in WWII, albeit one that didn't have the resources to fight outside its country.
Many cultures (including Chinese and Russian) have longer historical memories than Americans tend to have,
though I note that many Confederate sympathizers seem obsessed with details about the events of 1861-65.
In the 1982 film 'The Go Masters' (a Sino-Japanese co-production) there's a scene of Chinese singing a patriotic song.
When watching it, an elderly woman in my family (who was a young girl when Japan invaded China) started to sing
along (which she rarely did), hardly able to restrain her tears.
According even to American sources, the Japanese massacred an estimated 250,000 Chinese (including entire villages)
in reprisal because some Chinese had helped American airmen from the Doolittle Raid return safely to the USA.
When Americans write about the Doolittle Raid, some mention this war crime against the Chinese, but others do not,
dwelling exclusively upon the experiences of the American airmen.
About 50 or 60 years after the Doolittle Raid, the USAF invited a few elderly Chinese who had helped the Doolittle Raid
airmen to be its guests of honor at a reception in the USA. Some Doolittle Raid veterans attended the event, and there
was an emotional reunion between some Americans and a Chinese woman who had helped save their lives so long ago.
In gratitude, the Americans offered to buy anything that she wished in order to take home to her family.