Hearing various street 'vox pop' interviews with young Japanese people, they do seem somewhat…self-serving, but I think that's probably just 'being young'. Having tried to cultivate a few friendships with Japanese people, I find they often just disappear and the only ones I've remained friends with are the two in my sanshin-playing group who've lived in the UK for many years.
That's hilarious!
Do you live in Kyoto, by any chance?
How do you mean 'brittleness'?
It's easy to become id-driven and 'please yourself' because it requires less effort and reduces the potential risk of being disappointed by others. If you have little free time due to commuting+work, you might be less inclined to potentially waste some of it on accommodating company.
One of my greatest pleasure in life was just sitting with friends, over a coffee and food and just laughing about stuff; no expectations, nothing to worry about, just being within the warmth of friends. I miss those days…