The takeaway of the parent comment was that there are plenty of ways to use FB, perhaps in constrained ways, that don't lead to toxicity and don't require leaving the platform.
Im not personally a big FB user, but have applied this very successfully to my Reddit and Twitter usage. I follow/subscribe to a very small number of very high-quality accts/subreddits, and am selective about when I read the comments. I'm able to derive a ton of value from this[1] pattern of usage without running into the bottomless pits of stupidity and malice that the average reddit/Twitter experience contains.
[1] including the holy grail: a political discussion forum full of a wide variety of viewpoints and populated solely by mental adults