The question wasn't whether the teacher was allowed to talk about things that might upset a subset of students. In some cases, like talking about the Holocaust or slavery in the US that will not be possible to avoid entirely. The question was this:

> If a student asks a teacher not to call them something that offends them, is the teacher required to stop using the slur?

If a teacher calls a student a slur, or otherwise directly addresses the student using a slur/derogatory term, should this teacher stop doing this? Stop moving the goalpost.