I disagree that most of your examples are comparable, with the exception of gyms and coworkers/colleagues to a degree. Getting your hair cut is a qualitatively different type of experience. You have to sit still while it's happening, you can't just wander off. And there's even a degree of physical intimacy involved, even if it's purely professional. Likewise, in church you have to sit still, you can't go on your phone or leave early without people judging you. I think there's a reason why fitness quasi-cults like Crossfit and Soul Cycle have emerged, because the same principle is at play, social interaction with strangers is baked into the process. Sure, there are strangers at bars, concerts, etc., but you don't really have to engage with them and can walk away or go on your phone at any time.
> I disagree that most of your examples are comparable, with the exception of gyms and [...]
You mentioned gyms:
tl;dr: Karate dojos are a kind of gym with lots of community -- maybe too much!
Original post:
Gyms are an interesting one. Most are relatively anonymous, I think. But my (somewhere between first- and second- hand) experience of karate dojos was that they are very tight-knit, almost cultish (though not entirely in a bad way). People's SOs often joined, not really because they were interested in karate per-se, but because it was a way to spend more time together.
