I definitely would not agree with this and the user metrics of platforms like tiktok and instagram definitely would argue otherwise to your anecdote. Many are showing far more of an alleged window to their lives than ever before, key word being alleged as its always greatly curated in an way that oft attempts to make everything look perfect and effortless.

Absolutely are a lot of gen z who avoid social media, but to pretend most are privately hunkered away is completely ignorant of today's social media usage.