I walked up and introduced myself and said that I was a big fan, appreciated his hard work, etc. He looked at me coldly and just said "so are you going to buy something?" and motioned toward the booklets. I didn't need a printed copy of the `sed` man page so I shrugged and he seemed quite annoyed, turned to his assistant with a notebook computer and started dictating something to them, as almost to make it clear that our interaction was over.
I'm not sure what the point of posting this is, but that's my RMS story - it was my first "never meet your heroes" moment, I guess.
He was willing to civilly discuss and listen to a different point of view. We never reached agreement, but I felt that so long as an interesting twist on something dear to him is being discussed, he is patient for discourse.