Feeling Exposed in an Online Class is a case study from Justice in Schools. According to the summary:
A civics teacher at a vocational school (MBO) in the Netherlands finds herself in an uncomfortable situation when a parent interrupts her lesson, furious at what she views as “indoctrination.” The teacher brings the problem to her colleagues, leading to a debate about the meaning of safety in the online classroom, the best way to protect vulnerable students, and the role of discourse in the civics curriculum. With their school considering a permanent move to blended learning for civics courses, the teachers know that the challenges they face won’t be disappearing any time soon.
This is a good case for thinking about speech norms. It comes with a discussion guide and related materials,