In a foreign policy class I was in way back, the topic was being discussed: Why do almost all Muslim-majority countries support the Palestinian cause to one degree or another, yet the persecution of Uighurs is met with silence? Someone in the class asked if it was because the Uighurs were Turkic, and not Arab. Maybe that could be one factor, though it’s not like the Arabs all like each other either. China is powerful enough that countries realize it’s their interests to be on good terms with them.
it can't just be about power as the US is much more powerful than the PRC. Fear of one flavor or another? A knee jerk hatred of the west? Crazy idea, maybe they just hate Jews more than they like their fellow Muslims?