I haven't heard anything like that. I need to choose between this job and an Airbus 320 job now as I've been hired by both.
Having spent 7 years flying in china I know personally the bs you have to go through but when some instructor wouldn't stop yelling at us in the sim i walked out and the manager had a talk with him. Next day he was beyond quiet!
I've just head CSA is extremely disorganized and if you get the B777 it sucks cause most trips start and finish out of PVG which means join crew to there from GZ and that will be miserable. Plus 777 is mostly cargo.