(I went back and told the guy about the result of me looking into it. He said he didn’t feel interested in the topic anymore and didn’t want to talk about it. I said “wow, man, I feel pretty annoyed by that; you gave me a moral criticism and I took it real seriously; I think it’s bad form to not spend at least a couple minutes hearing about what I found.” Someone else who was in the room, who was very enthusiastic about social justice, came over and berated me for trying to violate someone else’s preferences about not talking about something. I learned something that day about how useful it is to take moral criticism seriously when it’s from people who don’t seem to be very directed by their morals.)
The doctrine of the Preferred First Speaker holds that when Person A speaks, listeners B, C, and D should refrain from their full range of constitutionally protected expression to preserve the ability of Person A to speak without fear of non-governmental consequences that Person A doesn’t like. The doctrine of the Preferred First Speaker applies different levels of scrutiny and judgment to the first person who speaks and the second person who reacts to them; it asks “why was it necessary for you to say that” or “what was your motive in saying that” or “did you consider how that would impact someone” to the second person and not the first. It’s ultimately incoherent as a theory of freedom of expression.
I’ve run into this phenomenon myself at times. Popehat calls it the “Doctrine of the Preferred First Speaker,” https://www.popehat.com/2013/12/21/ten-points-about-speech-ducks-and-flights-to-africa/ :