A little jesting is always appropriate, even in the most serious of forums.
Being an instructor is a thankless job. Once in a while there is a reward. This last summer I got to see a former student of mine solo his first student...that renewed my faith in instructing.
90% of the work will ALWAYS be done by 10% of the people in a volunteer setting. I've accepted that, and am willing to pay that price to enjoy my hobby.