Here's something that might work as an alternative example that doesn't imply as much bigotry on anybody's part: a PNAS study from earlier this year found that during a school year, schoolgirls with more maths-anxious female maths teachers appear to develop more stereotyped views of gender and maths achievement, and do less well in their maths classes.

Let's suppose the results of that study were replicated and extended. Would a female maths teacher be justified in refusing to think about the debate over sex and IQ/maths achievement, on the grounds that doing so is likely to generate maths anxiety and so indirectly harm their female students' maths competence?

[Edited so the hyperlink isn't so long & ugly.]