As a resident of Japan, this strikes me as complete nonsense. Life in Japan is extremely social. People strike up friendships all the time. Your pity is misplaced. Go to any izakaya and you’ll likely walk out with a few new friends, even if you’re an introvert.
What's your point? I live in a world full of people who are native to Japan. I'm not in some sort of expat bubble. I can go weeks without seeing any foreigners here. It's not difficult for me to know the perspective of people who grew up here.
