This is an abridged view looking at a couple of statements and news articles from a few days in September 2019. The free software community's frustration with Richard Stallman had been going on for many, many years before then. The most you can say is that it provided a public impetus for the organization to act, and perhaps that public impetus was driven by journalists who misread his words.
> I have been silent the last month because, until two days ago, I was an at-large member of FSF's Board of Directors, and a Voting Member of the FSF. As a member of FSF's two leadership bodies, I was abiding by a reasonable request from the FSF management and my duty to the organization. [...]
> For the last two years, I had been a loud internal voice in the FSF leadership regarding RMS' Free-Software-unrelated public statements; I felt strongly that it was in the best interest of the FSF to actively seek to limit such statements, and that it was my duty to FSF to speak out about this within the organization. Those who only learned of this story in the last month (understandably) believed Selam G.'s Medium post raised an entirely new issue. In fact, RMS' views and statements posted on stallman.org about sexual morality escalated for the worse over the last few years. When the escalation started, I still considered RMS both a friend and colleague, and I attempted to argue with him at length to convince him that some of his positions were harmful to sexual assault survivors and those who are sex-trafficked, and to the people who devote their lives in service to such individuals. More importantly to the FSF, I attempted to persuade RMS that launching a controversial campaign on sexual behavior and morality was counter to his and FSF's mission to advance software freedom, and told RMS that my duty as an FSF Director was to assure the best outcome for the FSF, which IMO didn't include having a leader who made such statements.
(Copious internal links evidencing those claims omitted, check the original.)
[0] https://sterling-archermedes.github.io/