No idea why you are being downvoted. While I cannot comment on skin whitening and being Han (never lived in China), I can absolutely attest to the rest of your

No idea why you are being downvoted. While I cannot comment on skin whitening and being Han (never lived in China), I can absolutely attest to the rest of your points that similar things can be observed in Russia (which to me, in a lot of ways, seems to be very similar to China culturally). If you have a child with disabilities, it isn't, unfortunately, socially acceptable to treat them the exact same way you would a normal kid in public. People prefer not to mention their relatives with disabilities and sort of "hide" them from the public eye. And if you try the opposite, people would definitely look at you weirdly. Same goes for dressing "appropriately", except you will also get a lot of nasty comments. There were no special-ed classes in my school (I went all the way from elementary to high school), and I have never seen a person with disabilities in my school, despite the fact that it was a large school (but we all still kinda knew each other, at least on a surface level). And I find it extremely unlikely that my hometown and my school somehow had such great odds, that there was not a single student with disabilities in a school of ~1.2k people simply due to the fact that everyone in town was that healthy.