Sorry, maybe I should elaborate. Professionalism is the act of work for pay. Exactly what you just denounced.
I've worked for many places where we joked about being "professionals" simply due to the fact that we were being paid.
The term "professionalism" is a dinosaur that has nothing at all to do with quality or attitude or really anything beyond someone paying you.
Effective smart people are humble and kind (like Matz). Blowhards are insufferable douchebags and no amount of fake rebellion against 'professionalism' is ever going the change that.