Trying to teach coding to a kid:
Kid: Can you teach me XCode?
Me: No but I can teach you Swift or Objective-C
Kid: But I want to learn to code in XCode
Me: Yes you will code in XCode but I will teach you swift
Kid: My dad said that you actually know how to code but apparently not.

So here is my take on a shitty teacher.

I once had a microcontroller teacher, who tried to teach a class of non programmers how to code, from a broken compendium. While he was teaching he would correct errors that he found. Most of the classes would be pure theory on C and no exercises.
Needles to say after the first two semesters none of the students could program, and over half of the class had left the school.