The "genocide" China is supposedly waging in Xinjiang province isn't one of mass killing. That isn't actually what they're accused of if you look at the specifics. They're accused of "cultural genocide" i.e. the systematic erasure of the cultural and religious practices of the Uigure ethnic minority.
Their "genocide" isn't killing anyone. Doesn't that strike you as absurd?
Meanwhile, the ongoing genocide in Gaza is being ignored and denied by the exact same countries that accuse China of committing genocide! Their hearts bleed for the Uyghur population (who are not being shot or bombed or tortured) and yet they can barely bring themselves to call for humanitarian assistance for Palestinians (who are being buried alive under rubble and bombed into oblivion and systematically starved to death)
One of these is not like the other!