He is obviously rattling leftists as they continue to make hysterical claims about him. The most recent and long-winded example comes from Nathan J. Robinson, the editor of Current Affairs. He published an almost twelve-thousand-word essay in that journal. It's hard to believe, but even with all those words he lands not a single blow on Peterson. He does manage to make a complete fool of himself.
His essay begins by listing an impressive group of people, including the head of Harvard's Psychology Department, who praise Peterson's work. He then sets out to try to prove them all wrong. He also lists a large number of writers who have treated Peterson unfairly. He then supersedes them all. There is no way to cover all the silliness in this piece, but I can explain a few of the problems in it. If you think I'm making this stuff up, by all means, read the whole messy, wordy essay.
Robinson has a long windup. There are many long paragraphs with snide remarks and hand-crafted editing designed to make Peterson look vague. The man is anything but vague. Finally, we arrive at the first factual disagreement with Peterson. In the famous interview with Cathy Newman, Jordan said that you now have more female than male doctors, and the trend in that direction is accelerating.