I can’t disagree at all that the world is worse because of Facebook or that people using it is the only reason it can make the world worse

Neither can I. And I'll take any opportunity I can to try and persuade people to organise in other spaces and espouse the benefits of doing so. (Check my Reddit account: it's been mostly inactive since the API debacle, but literally every contribution it has made has been friendly nods towards Lemmy and Piefed.) What I would never do is belittle someone for using it, apropos of absolutely nothing at all.