Is there information anywhere as to why she did this (in that capacity)?
My first thought was that this was a math teacher using the safety of imminent retirement to make a statement about all the pressure K-12 math teachers are under to make what they teach “relevant”, and that the choice of extreme offensive examples was to be extreme, not offensive. However, since it is instead a piece of internettery she downloaded and distributed, I wonder what the context was.
I used to teach in a classroom just after a freshman comp class where the (very popular) teacher often left things on the board that seemed a little edgy for such a class. I don’t mind erasing the blackboard at the beginning of class (some faculty get apoplectic at having to do this), but that semester I made a point of getting to class early, to make sure I wouldn’t get into trouble for subjecting the students to, for example, descriptions of genitalia on the blackboard. I talked to her once about this, she said most of these examples came from the students, but still.