The article is here.  As often happens, it doesn't quite record what I said accurately.  I pointed out that a lot of scholarship has been done on the racism of the canonical philosophers, but the value of doing that, which is clear, is a different issue from whether an undergraduate class should spend time on Kant's racism or his views about masturbation: it's the latter that is obviously an absurd waste of pedagogical time.  Kant is not worth reading because of his racism or his views on masturbation, and classroom time should be devoted to the aspects of an author's work that make the author worth engaging.