On the other hand, the controller was not annunciating in a manner that would be clear to the Chinese crew, letting his frustration show and making his RT suffer. I fly in China a lot, and although a lot of the chat is Chinese, the English spoken is usually precise and absolute standard ICAO. Their controllers are drilled in it and IMHO, achieve a good standard considering the circumstances. It needs to be, for not only do many foreign carriers use Chinese airspace, many Chinese carriers employ foreign pilots or don't speak the state version of Mandarin Chinese (known as Putonghua).
I used to fly into JFK and Newark, and I think the standard of NY ATC is less than average - of the 4 TCAS RAs I have had in my career, two have been flying into JFK. I now fly into Beijing quite a bit, that too has it's challenges. But at least their use of ICAO standard English helps mitigate a lot of the threats.