Compliments to L124C for attempting to educate the ill experienced, and for warning the dock mates. Just ideas.
This is fun Don,
I've got another idea for L124C
Next time you are both on the dock ask him if he will do you a favor.
Hand him your camera and ask him to video you and your wife leaving the dock, turning around and coming back in.
Tell him it is for this cool internet forum you belong to.
Now if you want to be really cruel after you do it perfectly the first time complain about how sloppy it was and that you want another take.
That way he gets to watch again.
What's he going to do say no I wouldn't take your picture?
If his girls and wife get to watch it will be even better.
Then after it is all over you could ask for his advise on really important stuff like if he thinks you should take a full turn around the cleat before the cross turn or make the cross turn immediately after going around the horn.
Then you can engage him in a discussion of the best techniques and what he things works best.
It takes a deft hand but it is possible to teach someone who is too proud to learn. That is of course if you want to take the trouble.