However, they might think that a professor exposing himself to his students is an abuse of power and sexual harassment, due to the local cultural consensus around what that specific action means, and the unequal relationship between teacher and student.
No, that is not the direct equivalence. The direct equivalence for 2. Would be something like
“But then they insist that being naked is never acceptable and is grotesque, and anyone that disagrees is a gross pervert”
That’s where the inconsistency comes from
Except that they probably don’t think that.
However, they might think that a professor exposing himself to his students is an abuse of power and sexual harassment, due to the local cultural consensus around what that specific action means, and the unequal relationship between teacher and student.