If some form of positive feedback is to be considered a vital part of each lesson, a valid question might be to ask if, in fact, the teacher managed to fulfill this requirement. This is a yes or no question not a point for discussion as to why no positive feedback was possible. Either there was positive feedback or there wasn‘t. Taken like this, the comment of the third person was ‘uncalled for‘ and ‘tactless‘ but not so far off the mark.
I appreciate that this is harsh but it is not a judgement at all, but merely reflects my own problems in the past in coping with ‘learners‘ who make little or no effort to do their part while expecting me to successfully ‘teach‘ them.
Only if your pupil is a dysfunctional child! If an adult has not done any of the tasks they have been set, they shouldn't expect to be praised for it. What other area of life would that happen? We should always remember to tell pupils what they have done well, but if they didn't actually do anything at all then surely we shouldn't lie.