Why is it more important than ever that the Chinese have sympathy for the Jews hence why Schumer wants Xi to take a stand on the events happening now? In their versions of history based on their religions, the Chinese don't even exist.
The ROC was one of the only countries to accept Jewish refugees fleeing the Germans in the lead up to WW2. The overwhelming majority of Jews remember and are deeply grateful for this, even if you yourself have forgotten this part of your own country's history.
Your post reads like a bunch of logical leaps and extraordinarily cherrypicked examples to justify a pre-existing prejudice. Yes China is not at the top of the minds of a diaspora that originally came from the levant and has had nearly all of its history confined to the western hemisphere. Why should it be? Likewise Jews do not take Chinese apathy towards them as a fault, since China historically had nothing to do with them aside from the above example. They actually like being ignored since being the center of attention is a bad omen for them.
Yes the overall number of Chinese killed by the IJA is higher than Jews killed by the Germans. Why is this relevant? I understand the west in general downplays the Chinese experience of WW2 but this is done mainly by neglecting the subject of the Pacific theater and only showing the American perspective of fighting the Japanese when it is discussed, not by appealing to Holocaust casualty figures. You are making this about Jews when it just isn't.
And your anecdotes are void. There are 20 million Jews and 1.4 billion Chinese. In the ensemble of all interactions between them there are bound to be good and bad ones, what matters is the statistical trend and that emerges, and that is one of general mutual indifference aside from the very much positive memory of Chinese generosity in Shanghai.