by saying ni hao (hello)
In most of the world, they don't. Wherever you are probably involves a lot of Chinese students.
Banned entry of all Chinese expect students, teachers, merchants, tourist and government officials
Bonjour
no teachers don't tickle students
The nouns in the sentence are students and teachers.
why should teachers challenge students
I think the teachers who see students as individuals, look them in the eye and greet them are more well liked. Setting expectations and followup with grading practices so that students know that they are doing well is also an admired trait. Interesting, surprising lesson plans are nice, but without the personal touch probably are neutral in effect.
Unless their students are Chinese (or Chinese-speaking), they don't. For those that do, it is because there is no other way to teach the students what the words mean or how to use them; think about how easily a person from the US or Britain could learn Sawhili if only Swahili was used in the class.
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Teachers should treat students in the same manner as they would expect students to treat them.
The breakdown in communication between teachers and students is disrespect. The solution starts with the teachers learning how to behave, instead of reacting to a situation, Behavioral skills are important to teachers and students
As of 1992-93, there were 835 teachers for 9785 students (http://www.ankn.uaf.edu/IEW/edgreen.html), or about 85 teachers per 1000 students.