I only joined FB 3 years ago, for similar reasons to you. I've deleted/ never had Twitter, Instagram, Reddit, LinkedIn and whatever else there is. I'm also quite socially isolated, as a carer for my mother, although I do have a motorbike as a hobby, which gets me out. And I no longer work. I've seen the same thing and just put people on mute so they stay friends but I don't see their drama. Some destructive people I've blocked. If anyone asks whether I saw something on FB, I say I've been involved with some of the social groups I belong to on there, so haven't checked my timeline feed or messages. Or I've been following a recipe on YouTube. Then I turn the conversation round to their issue and the subject changes soon enough. Which is when I zone out. So I can stay sociable but not get dragged in too much.