Hm I have been out of (German) university since two years and before that attended in a wide range of places and courses for seven years.
While I have seen gendered wording in some places, I only encountered it on a personal level in one instance. I was working on a presentation for a class on quantitative research in social sciences with two other girls and one of them asked weather we would use gendered nouns in our presentation. I succinctly proclaimed, that I did not approve of gendering and rejected using it (but they could, if they wished).
That was the beginning and end of my experience with that stuff. The (female) doctor teaching us did not seem to care in the least.
I join my fellow Germans in being skeptical about horror stories like the one in the OP.
Not least because I suspect the case of the OP to violate the students basic rights as a student.(though I am not sure about)
If such a thing happened, after a talk to the teacher, I would advice to go to the faculty student council. A case like that is in their job description.
The whole situation is insane, in my opinion. Its like at the end of 1984 when the protagonist is reeducated and forced to believe that 2+2=5.
How can these people believe that changing the language in this manner will have any effect on real life gender equality, it does not work in countries with languages that have no words for he and she. One of those languages is Persian (Farsi)., an other one is Finnish.
Well the simple act of making this effort does raise a lot of awareness and asserts a lot of cultural dominance and, I speculate, does actually more for the cause than the change of language itself. So even if the language itself is not that problematic, actually, it is still a nice target to "fight the good fight", which comes with its very own value.
In principle.
In practice, I not only highly dislike gendering for aesthetic reasons (though as has been noted there may be exceptions where it is convenient and sensible), I also distrust such a blunt-force attempt to change culture in such a.personal zone (the zone of how to express yourself). And oh wonder, this kind of strategy is accompanied with tendencies of narrow-mindedness and lack of necessary nuance and perspective in the feminist movement.