To be fair, in making it easy for lecturers or anyone during conversations, choosing a gendered pronoun is not egregious. People get annoyed about this, but it’s not that she thinks every nurse is female, she just wants to be able to flow through her ideas easily as she teaches, and that means not stuttering through saying “his or her” every time.
I used to read this wonderful workplace advice blog religiously and the writer would always refer to managers or anyone else as “she” when giving advice. Readers called her on it all the time, so she would gently explain that when someone who has written in for advice hasn’t specified the gender of the players in question, she refers to them as “she” because it’s easier for her to do so in writing and looks less clunky. I would agree, especially in conversation.