In a teaching observation this month my department head noted as a point for improvement that I should try not to use gendered language when addressing the class. I use boys & girls or ladies & gents depending on the age of the students. She advised this was in order not to potentially offend any trans children. She also mentioned this to some of my other colleagues and gave them the same advice.
I care about my students and would never humiliate anyone. Is this just the norm now? What do I use instead?