"Autodidact"? Why not just "a self-taught person"?
Eschew obfuscatory pedagogy, my friend! It is ironic that those most often guilty of pedantry are those in the ivory tower (decidedly "non-auto-didact-a-tory")

I doubt any among us are purely "autodidactical or non-autodidactical".

Learn from yourself, but don't discount those around you, and their role in such "self-teaching." Does a lesson taken from someone who does not hold the formal position of "teacher" count as a mark for or against auto-didact-ism? What about the things we all learn here, where we read the conversations and thoughts of others willing to share? Even if we do so at a computer in a room by ourselves -- "on our own", are we really "teaching ourselves"?

I believe it's an artifical distinction.

n.b. one connotation of the word "didactic" is being a judge of morality.