Bottom line is usually true, those who can DO, those who can't TEACH!
Well I do both - fly the line and teach. So does that mean that I can, but only on certain days? Perhaps only Monday, Wednesday, and Friday; but only if the Friday falls on the 3rd of the month during a full moon.
Sure, there are some time builders out there at the ab initio level who teach straight and level and don't care about anything but how much time you're giving them, but boy if you
can't line fly at the airline level, then you sure as hell
can't teach.
I wonder, do you let your instructors know how you feel before you attend a training session? You know, just to put them in their place?