The poster 'englishgibson' has made two cardinal errors:
First, he used bad language when criticising his lazy and/or dull Chiense students.
Second, he dared to criticise the Chiense goverment in front of his students.
Net result, his students deserted his classes en masse.
Don't do as he did. Remember, the best way is to tell your students not to worry because they will all pass. And never criticise the Chinese goverment to anyone. By all means, criticise your homeland's goverment, though, no problem. Follow my advise, and you can stay here as long as you like being well-paid for going through the motions of being a professional teacher. The money's very good for doing very little. Don't be your own worst enemy, like the poster 'englishgibson'. That'll put you into trouble.