If what Hermie is describing is accurate the instructor is incompetent.
I would ask the regulator who gave said instructor his / her license and then demand the regulator remove the inspector from the position of issuing flight instructor ratings and change his / her job to mowing the lawn with a push lawn mower with no engine.
And hire the instructor as a helper, to rake and pick up the cut grass.....
That will give both of them a position that is useful to society.