A certain GNU contributor, let's call her Sal, was voicing concerns with current practices. Someone else replied to her with "Sally," condescendingly talking down to her. To this she said, "I did not invite you to call me by a nickname. Call me Sal."
A sub-discussion then erupted about the etymology of "Sally" and whether or not it was technically correct to someone who preferred "Sal" to be called "Sally" instead. Instead of, you know, just calling people what they want to be called and be done with it. And not be condescending about it.