Readers confusing some issues in a written piece about prospective employment with the positions of the author on wider issues such as (presumably in this case) feminism, immigration, race, colonialism? And then climbing on various pet soapboxes regardless of whether or not they are pertinent? Why I never...
Seriously, I'm surprised you were surprised, and actually expected backlash/comments on more issues the moment I read the piece, from people a) that just like to voice PC dissent; b) who work in cultural studies and read the subtext of these exchanges; c) who actually were at one point on the other side of those letters (or know someone who was).
Not because I agree with it, but because it is kind of par for the course.
As I hinted above somewhere, I was in position c) a while back and can both relate to why these things are written, understand what they represent, and marvel at how ruefully inadequate (and, yes, funny) many are.