We do recieve the training in our FI course but...
Depending on your boss we only get checked every 3 years.
And as I have posted previously it should be started on a good point, inflict the damage

then end the debrief on a few high points.
Again this is all based on your relationship with the student.
And after 5 hours instructing with another 2 hours to go sometimes you don't quite give them the boast you should.
"your doing fine, yes your crap but you have only done 1 hour in the circuit, so practise make perfect" with a wee throw away line as you leg it towords the next student "I still can't get them right myself everytime"
I personally prefer to get the student to debrief themselves using leading questions.
"so what do you think we have improved on in the last lesson?"
Which gives them a chance to cover some good points.
"So what went wrong"
Then add in at the end of the list what they really did wrong.
But humour them when the bring up something which is pish.
"So what do you think we should work on next time?"
Making a list makes them feel more envolved with there training and makes them feel as if they are driving the lessons. Then add on the points you really want to cover.
Then add in at the end something which can be completely bollocks about improved airmanship etc which makes them leave on a high thinking they are getting somewhere.
I really can't see the point getting wound up to the point that you shout at a student. They are stressed and are less responsive to teaching. I get my BP up and don't enjoy teaching the lesson.
So not only does the punter come out pissed off with themselves and you for bitching at them. But you have worked 5 times as hard because you have let the situation get the better of you.
MJ