This is not the basis for a sound or successful lawsuit. It is the teacher's job to shape your in-school conduct. Each student is judged differently based on the particular facts and circumstances of that student's conduct. You have almost completed your schooling. Put your head down and finish your path and then move on with your life.
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Do you have a copy of the student policy handbook, as every school should provide one or access to one to every student. Also, are there any students that have witnessed the teacher's behavior.
It appears that there are possible resolutions to this problem.
Best of luck!
Valerie J. Semensi, Esq.