[genocidicbunny]

The parent didn't say "literally no meaningful social connections". You're asking for proof of a point that wasn't made.

Sadness, loneliness, isolation, these are not things that you can measure with such binary precision. They're emotions, and they vary, person-to-person, and moment-to-moment. Is it not plausible that for some people, 'social interactions suffering', even if not completely removed from social connections, is enough to make them feel a profound level of sadness or loneliness or isolation?