I'm a bit disappointed that noone on HN seems to be saying: "Someone who speaks for the free software community should be a person who's good at speaking to many different people, smiling honestly, and putting the community and its concerns in language that makes sense for the people he's talking to at the time". IMO that's the core of the matter.
I'm not sure whether it really makes sense to talk about a free software community but I do think that Stallman leering, being rude, trying to pick up women at conferences, straying into random controversies such as about Minsky, berating people for their choice of wording, I do think that all that makes him a really bad candidate for that kind of job.
I'm not making a case for or against him. I have a very strong opinion, but talking about him tends to be a lightning rod issue and ultimately does not results in high quality discourse.
If you want to know more about the allegations against him, then here are two articles to get you started.
Honest question from someone who only lightly followed this story: what is his history of abuse and harassment?