Well, having read that article, I can take a decent guess about the sort of things Jordan Peterson writes, but it did assume everyone reading it was familiar with the doctor's work.

I'm in favour of the basic philosophy of political correctness, but, as someone who has always regarded themselves as a supporter of parties on the left, I accept that shrill individuals getting worked up about nothing in particular who give the "political correctness gone mad" crowd yet another opportunity to repeat their mantra cause great harm to the cause of left wing politics.