I made no such claim. Also "founding myth" is a term with a distinct meaning separate from "mythology" in that it is not necessarily untrue - romanticizing the truth and excluding any unflattering details is usually enough.
I really wish more people read biographies, especially by multiple people who where belligerents in the same conflict. When you hear the same story told from different perspectives, you begin to question if the history your were taught was in fact, the objective "reality".
What you called "reality" was just a perspective from a single point of view, which I can safely assume was European.
One of my high school history classes presented this view; we used A People's History of the United States as a textbook.
What role did France play in the Boston Tea Party? I'm not aware of any at all. Certainly France jumped in once they saw the opportunity happening, but the idea that the revolution was really part of the conflict with France is just wrong.
The "American" studies class was about the Constitution, various laws, major Lobbying groups (ACLU, NAACP, FOP, NRA), how primaries work, etc. etc. American history was left to grade school.