Tbh I don't take this for fact. My alternate theory is that schools aren't rejecting Asians for being Asian, but rather they are rejecting profiles that are common to ASians. How many apps do you think Cal receives every year with 4.3 GPA/2200 SAT, 4 yrs key club, no sports, and an essay about being nervous in a piano recital? If you get ten of those, and maybe one application from a kid in Inglewood with an 1850 SAT and a childhood fraught with gang violence, then I can't blame Cal for taking three from Category A and one from Category B, leaving seven families angry that their higher SAT was rejected.
The disconnect for some Asian parents is that they're stuck with the Chinese idea that highest marks always equals best university. As a result they push push push their child to test higher on the SAT, GPA, farm community service hours, play more piano... But they don't realize American schools aren't solely score based, and at the end of the day, there comes a point where the University just isn't impressed by the same profile over and over again.
As a supporting anecode, I'm Chinese, and I was admitted to a competitive department at UCLA with a 3.7 unweighted GPA in 2009, which was far below the average for whites, or asians. So I don't think there's a conspiracy against Asians.