Notice the ploy used by the columnist-- talk about the money he's earning.  The intent was wholly deliberate; she wants to inspire envy and/or and suggest that Prof Peterson's actions are only motivated by earnings.  Do you think Chiose would ever dare talk about how much money Margaret Atwood makes per book??

Ploy #2: make Peterson look like he's only supported by online trolls, while good ol' honest "students" are the ones he's upsetting.  

Ploy #3: pretend that people who use harassment tactics are only right-wing.  The hate mail Prof Peterson has received has been as vicious as anything you'd find on 4chan - and it's all from left-leaning people.