Earlier quoted context omitted.
I think that this is just an attempt at explaining away toxic behavior without taking responsibility for it. People in the OSS community can, at times, glorify toxic behavior. I know people who take it as a badge of honor to "speak the truth", "speak directly", or "have no filter". Speaking directly and speaking the truth are good ideals to have, but if you really want to PROVE that you speak the truth and don't fear…
So expressing sincerely held beliefs in a personal forum like his own website is in and of itself "toxic"? Many of RMS's beliefs are indeed well outside the mainstream, but as far as I'm aware nobody has ever accused him actually doing anything abusive to anybody.
He's been accused of things that are at the very least Somewhat Creepy. "Abusive" is a pretty high standard to reach, but I also think it's irrelevant. The way he treated people, coming from a person with power or authority, was likely to make people feel unsafe, and he was unwilling to recognize that the desire to have that position of social authority implied an obligation to mitigate such behaviors.
I think the community would be richer and better (and probably noticably more diverse in a number of ways) if either he'd changed his behavior and recognized the importance of these effects, or he'd been considered a non-leader of the community and merely an active contributor with strong opinions.
It's easy for people not familiar with these dynamics to massively underweight how much implied social pressure comes with being hit on by a person in a position of power within an organization. My usual assumption for someone with as much implied social authority as he had at MIT would be that it would basically be generally inappropriate for them to be hitting on anyone who wanted to be in or work in the lab or department they were affiliated with, because even if this specific person genuinely wouldn't abuse their power, many other people in comparable situations would and it's not really reasonable to expect people not to react to the possibility when it's such a widespread problem. (And yeah, that can sorta suck if you're lonely but in a position that makes it hard for you to hit on people without making them uncomfortable or afraid. One alternative is not to pursue or remain in such a position if it's a problem for you.)