Just more info concerning preferential treatment of minorities in China:
1. They are exempt from the famous one child per family rule.
2. They are preferred over the Han majority in job placement (Ex: If two people are of different races but of the same qualifications, the minority will get the job)
3. Minorities have easier requirements to qualify for college entrance exams.
That is not to say that the Chinese government treats minorities particularly well, but it is easy to see the resentment between the Han and the Uighurs.