Delete your account?
Additionally, Facebook has become the defacto communication platform of the day and not having one is sometimes viewed as a social red flag (or as a lie). My cellphone # has changed three times since 2004, but the respective Facebook query has only become better at finding me. My point being, "delete your account?" is something akin to "cancel your cell service?" except nobody calls and everyone uses Facebook.
Also, I finally think it's working. Previously when I tried to approve a tag of myself in a photo, FB wanted to change the privacy setting back to "anyone can tag you", but last week it seems to have worked without changing my privacy settings.
I see you've already anticipated my response. Beyond that, it seems like every six months or so I'll discover that some of my settings have been mysteriously reset during a site update or that the introduction/consolidation of new features results in a regressive behavior that I have to explicitly disable (since it's on by default).
Facebook privacy requires regular maintenance.
Not everyone is as enlightened as your non-strange social group. One doesn't face ostracism for lack of a Facebook account, but a lot of real social interaction occurs on Facebook and I don't presume to judge those who highly value that interaction. Those people do exist and some of them are great people.