If the service is good, she is very effusive with her praise ... . If she thinks the service is subpar, she proceeds to instruct the server on how to do better

One time we had a young waiter who was in training, and my friend was telling him how to stack up the plates as he cleared the table. I couldn’t help myself and just blurted out, “Please stop.” Should I ignore this from now on?

If “Please stop” did not work, Miss Manners is afraid a more polite approach will not, either. But if similarly pressed, she would say, “Let’s let these servers do their job and just enjoy one another’s company,