Earlier quoted context omitted.
You're not a "fundamentalist" because you mention the fundamentals of a field of study. It's impossible to have a discussion about anything if some things are not taken as axiomatic. And given that the person you're responding to is stating something that most economists would agree with, I think the impetus is on you to tear it down with "the scientific method" if you think the prevailing wisdom is wrong. TLDR: don'…
No, you're a fundamentalist if you stick to an ideology (e.g. trickle-down) in spite of all evidence suggesting it is highly flawed. > It's impossible to have a discussion about anything if some things are not taken as axiomatic. You mean you personally find it impossible to have a discussion with someone who disagrees with you on the axioms of economics because it means you can't frame the argument in your own terms…
My only point was that you may have better success railing against the conventional wisdom by providing an actual argument that it's wrong, not by ranting and raving about the existence of prevailing wisdom itself, and demanding that everyone provide a detailed proof every time they reference it.
You should check out the works of Milton Friedman, you might find them interesting!