"How do/did you go about establishing that your current teacher is qualified to teach you how to "fight?" "

I trained for several years prior and sparred with many upper level students and instructors (and did ok). But when I sparred with him I was

"Botttom line here is that IMO if people don't want to learn what is being taught---then they should quit.
If they are irked at the time the teacher is taking but find the training useful overall--then they should suck it up and quit bellyaching."

If the training is not what your looking for---then find someplace else that DOES meet their needs."

I agree.