I was proud to be a "travelling substitute". The caliber, backgrounds and skill of my peers was amazing.
Why don't you try substituting in inner city schools and observe what they do, first hand?
Yoo hoo! Words have meaning. You did notice that I used the qualifier “in general,” correct? That means that I am a speaking of many, but not all, substitutes with whom I had experience.
I taught, by the way, for 22 years in a school district where 60+% of students were receiving either free or reduced price lunches— basically an inner city school district in the suburbs.