The emotional vitriol inspired by social media is completely unfounded. You can make it whatever experience you want; people just like to complain.
This article should be titled, "I don't know how to use social media so I gave up on it."
The rest of us use Facebook or Messenger to organize events because there's a lot of us and it's the most convenient mechanism for organizing group activities. If people choose to opt out, it's up to the organizer whether they want to go through the additional mental effort of communicating everything to the Luddites through whatever special communication method they require.
Mostly, we just require the Luddites to find out about events and updates themselves. (Usually they find out by overhearing the rest of us talking about upcoming stuff as its being planned.)
The end result is usually that the Luddites get themselves back on to Facebook after 6 months of missing out on shenanigans.
I might miss an awkward BBQ with an old friend I never see but I'll be doing something else worthwhile, often with someone I have a more meaningful relationship with. And all the big events in life like weddings, funerals and major milestone birthday's are handled by personal invitations anyway.