Fast forward 40 years ...... I now occasionally visit a club where a nidan instructor regularly teaches, what I regard as "poor fundamental skills" in the form of one handed grip attacks. I am much more senior in age, rank and experience to this instructor and it drives me "NUTS" to see such clearly poor technique being introduced to a mixed class of children and adults.
Unfortunately an elderly friend of mine ranked shichidan is the chief instructor and never says "boo" about these silly and irritating techniques. So far I have said nothing but never join in on the practice of these silly moves and simply teach a similar but more orthodox technique using TWO hands emphasizing kuzushi.
I suppose this question relates to any visitor at any club where poor judo fundamentals are being taught. I wonder what some of my esteemed peers thinks about one's obligations of respect and civility as a club visitor vis-a-vis a more senior instructor's obligation to promote good judo?