I have never allowed a student in my class to use a cell phone or sleep in my class, that is not only disruptive but rude as well. I have had more problems while in universities with that rule than I have ever had while working in a training school.
If the school chose to fire me for my convictions so be it I am not worried about finding another job. I have been at a training school for over four years now and have not once had my Chinese counterparts give me hassle about what rules I have in class.
Again I would say that if a school does not support their teachers the best thing to do is leave. The demand for good teachers does not meet the supply at all. this gives FTs the ultimate power as they can decide where to work. Training schools can be just as strict as any other educational institution perhaps even more so. By ejecting unmotivated or unruly students from the class improves the class and the school as a whole. Plenty of times I have seen students given their money back and asked to go somewhere else when it is obvious the student has no desire to learn English. At the universities or public schools that is not usually the case as the administration of these schools support the students more than they do the teachers.