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Last time the instructor told me in front of my students that I don't understand "simple things" and that I am "playing games".

This is where she lost her argument. You should have simply totally ignored her. Let her make a formal complaint and only respond to such formal complaints. You don't have the duty to respond to insults, or to look up what the guidelines say in response to insults. If you were violating the small print of some guidelines, then it usis her job to point that out to you.  

Last time the instructor told me in front of my students that I don't understand "simple things" and that I am "playing games".

This is where she lost her argument. You should have simply totally ignored her. Let her make a formal complaint and only respond to such formal complaints. You don't have the duty to respond to insults, or to look up what the guidelines say in response to insults. If you were violating the small print of some guidelines, then it us her job to point that out.  

Last time the instructor told me in front of my students that I don't understand "simple things" and that I am "playing games".

This is where she lost her argument. You should have simply totally ignored her. Let her make a formal complaint and only respond to such formal complaints. You don't have the duty to respond to insults, or to look up what the guidelines say in response to insults. If you were violating the small print of some guidelines, then it is her job to point that out to you.

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Last time the instructor told me in front of my students that I don't understand "simple things" and that I am "playing games".

This is where she lost her argument. You should have simply totally ignored her. Let her make a formal complaint and only respond to such formal complaints. You don't have the duty to respond to insults, or to look up what the guidelines say in response to insults. If you were violating the small print of some guidelines, then it us her job to point that out.