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1. What is etiquette?

The customary code of polite behavior in society or among members of a particular profession or group.

Explanation:

Etiquette is the set of conventional rules of personal behaviour in polite society, usually in the form of an ethical code that delineates the expected and accepted social behaviors that accord with the conventions and norms observed by a society, a social class, or a social group.

report them to the principal and if they dont do anything about it get your parents involved and keep reporting the teacher.

obviously, the latter.