Earlier quoted context omitted.
This kind of withdrawal seems to be happening in many cultures. In Japan it's called hikikomori . I forget what it's called in Italy, but I know I've read about it. Here it's the same, except ours tend to be more violent.
I don’t know enough about Japan to say anything on this matter but at least in Italy, unlike America, it’s fairly common for adults to live with their parents until married, without social stigma (well, if they have a job).
Is this really true? You are describing the quintessential basement-dweller, which is not exactly a rosy stereotype.