Then I googled it, and it turns out that you are likely referring to a larger, different event where I was not present.
It seems like he did this a lot, then? He definitely harassed a young woman at an event I organized, and did a 1-1 version of this emacs virgin thing directly 'at' her. It was weird, creepy and I did my best to deal with the situation and help the audience member feel more welcome at the event after the harassment. She was visibly upset and very uncomfortable in the moments after he said it. It happened before a talk he was scheduled to give, as the audience was arriving and sitting down.
Had no idea that this wasn't the only time it happened. Didn't know there were other instances.
Alas, our modernity seems to be more prudish in these matters; so people react to this sort of thing very much like a pre-60s person; and RMS didn’t get the memo.