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.
But, RMS is known to be socially awkward, the same goes for many autistic individuals. It's just that he doesn't mask and comes out as “rude”. If send an e-mail, he will usually take his time to write down a succinct response.
You realize people are different, and your knowledge of tiny number of data points tells you very little about people who aren't those people you know?