Usually you draw this line by “locking” a title behind some kind of education or certification. If someone carries this title, then it must mean that they at least have a basic understanding about x skill.

“Programmer” and “developer” aren’t protected in any meaningful way, and I’m trying to hammer that into my brain, as I did not really see someone who hosts a template Wordpad site as a webdev, or a Python scripter as a programmer (scripting is programming, but programming is much more than scripting, so comparing the two didn’t make sense to me).