>>1 you seem to be all riled up by this. You sound arrogant, most likely because your all entangled in the situation. Try taking a step back. Ignore them, be above them, be stronger. Accept them for who they are, and then don't let then disregard them entirely.
View their attacks for what they are;
desperate, weak, and pathetic.
If they physically harm you, well you told the teacher beforehand so there is a known threat. If you feel that you are in actual harm, I suggest you tell others about it, and go to the information brokering thread in Main and look for Siyos' CQC concept guide.
Live your life as if they don't exit~ or better yet; accept their existence and actions, and then move beyond it.