Good insights.I think the answer is more complicated than the question. I certainly think your guess is a good one. I'm pretty sure they don't have friends or genuine social connections. That seems to be borne out in a measurable way by the time spent posting on JPP. Several of the posters who can't stand to see friendly or even innocuous interactions between others spend all or most of their waking hours here. Most of us go through phases of supersaturation with certain pastimes, but the angriest, most bitter members here have been posting during all of their waking hours -- usually while not even lucid -- for years. Not only do they not have social connections outside the internet. They don't even have another hobby within their home, yard, or community. I wrote a paper in college more than 20 years ago that touched on the alienation, anonymity, and loneliness that too much online interaction fosters. We see it play out in real time here every day.
I think there must be more to the story, though, with certain posters here, particularly the one who rages passive aggressively about everyone who participates in sincere, pleasant, mutually respectful exchanges about nonpolitical subjects. I suspect severe, untreated emotional trauma. I am personally familiar with a lot of the symptoms of it and see them on display in JPP, but I'm also not a medical or therapeutic professional nor do I think anyone can be conclusively diagnosed based on what they write on a platform like this. I think it is not controversial to say, however, that it's unusual to seethe when seeing people connect and socialize. It's also disturbing and destructive to openly attack those interactions for seemingly no proximate reason.
In this specific case, I consciously weighed the benefits of sharing some personal details with trusted friends in a positive, public thread versus the risks of malevolent individuals seeing and misusing those details. My solution was to openly share only as much detail as can't be used to harm me. Those who become agitated by those details and attempt to deform their positivity into something else can waste their time until their hearts remain as uncontented as they were to begin with.
You also have to wonder what kind of weirdo is lurking a thread to read friendly banter being shared among friends.
It's no different than if I was at a restaurant with my friends and some lonely weirdo was lurking us and eavesdropping our banter.

