According to Wikipedia, an iconoclast is “one who attacks cherished beliefs.”
Aaron Rogers is one of the all-time great football quarterbacks. He describes himself as a critical thinker. I would describe him as a mere iconoclast.
If I spent the rest of my life studying football 24/7, I would not know 1% of what he knows about football. However, I doubt if he knows much about epidemiology.
I have spent the majority of my adult life studying economics and probably know at least 1% as much as any Noble-Prize-winning economist . . . but I know nothing about epidemiology.
In my extended family, there is a surly 65-year-old iconoclast who has never agreed with anyone in his whole life.
“I disagree . . . therefore, I am.”