A lot of frustration this last week with my instructor. He is a reasonable good instructor but he is really struggling to get his own kids to black belt, and has resorted to forcing them to attend. As a result he allows his youngest son (16 yo brown belt) to "teach" the underbelts during sparring rather than sparring with older and more experienced brown/black belts, since that allows his son to avoid taking any real hits during sparring. Long story short, last week the young man was dominating a shorter younger female green belt rather than teaching her during sparring (using kicks to prevent closing, etc) to the point that she was crying in frustration. Eventually I had to pull them apart and keep a VERY tight grip on my temper as I explained to him that his father tasked him with the job of teaching and that he was NOT teaching at that moment. Instructor watched this happen and watched me respond and if he said anything to his son it was not within my hearing.
Rather than just being an excuse to vent (although I thank you for that) I wanted to ask the group if you had any suggestions for dealing with kids (or students in general) when they decide to take advantage of superior skill and rank to avoid work. I think the young man never gave a thought to the fact that he was making the class miserable for a younger student, I suspect he only wanted to get out of sparring even against a green belt 20 kilo lighter than he was. But I suspect this becomes more common especially when a instructor has some kids only attending group classes and other doing private lessons, or when the parents are forcing the kids to attend and I wanted to see if any of the group had similar experiences.