Without appropriate social interaction - meeting people, chatting, discussing or arguing, an individual might find themself in somewhat of an echo chamber.
Naturally we form our perspectives from various observations, assumptions and speculations. Some of them can be somewhat disconnected from reality, or even unhinged. An individual without sufficient social grounding might absorb these unhinged/unhealthy perspectives as solid life structures. A negative mental or emotional charge might build up as a result.
I also encountered such 'echo chamber' within isolated couples - they are somewhat distant from friends, family and colleagues so they don't meet other people too much, or at least don't give their inputs much importance, disregarding their opinions. It can actually be a healthy distancing in case friends or family are toxic. But the echo chamber effect applies nonetheless. Its different from the 'sticky couple' dynamic. Its more about how diverse are the ideas and opinions you hear and trade, and depends on your mind flexibility - it doesn't require much of it, but some people have no self criticism ability at all. On the other end we have the 'over self critic' who over-intellectualizes and over-complicates their own introspective process. If they do not test their conclusions in real social situations - they might anchor unhealthy takes into their perspective, just like 'no self criticism' individual.
I wonder if it also applies to bigger social structures such as small town communities.