I was not able to read all the responses...my first response would be to do all that you can to be the most effective professor you can be or bow out at the end of the semester. Fighting this battle may not have the outcome you are looking for...of course...I don't know if you wish to continue being a professor...if you do you will spend so much time tied up in legal versus illegal that 1. your preformance will drop or 2. prevent you from moving to a new position. Previous employment references are pretty tight now days...people are too afraid to say anything...I would imagine a school would be too...

Anyway I have over the years seen people who receive critism to the point of probabtion pull out of it...although many times...more often than not...I've seen self-destruction...

It can feel like you are being signled out...I don't know your situation...you may be? or are you? are your filters looking at this correctly?

You and I can go through some of the deficiencies and see where they can be corrected.