^^^ What is true is that the Founding Fathers detested titles. Anything that even hinted of nobility, aristocracy, or elitism was avoided. The first presidents weren’t called “Mr. President” or “President _____,” just “Mr. _____.”
I went to the University of Virginia, which was founded by Mr. Jefferson (not Governor Jefferson or President Jefferson!). The tradition still continues. Regardless of their credentials, faculty members are never addressed as “Professor,” “Dr.,” etc., just as “Mr. _____” or “Ms./Mrs. _____.”