If I get (as I will) any attempts to lecture me from little Chinese teachers, I cut them short and tell them to mind their own businesses-I even ban them from the classroom sometimes.

Bear in mind this can cause the loss of face so valuable in Confucian cultures, and non renewal of contract, perhaps, even loss of employment. Different ball game in China, tread carefully, but lots of jobs to choose from so I never really gave a flying monkey...although I'll admit it did suck being lectured, would they like us to do the same to them....hmmmm?