Imho it can be very misleading to think of Instagram feeds, or any social media for that matter, as "private life".
Many social media users are very self-conscious and calculating with the "image" they are building with particular accounts.
It's all feeding into this idea of perfect infallible human beings, as supposedly showcased on social media, but in reality, such humans simply don't exist.
Particularly in the context that often it's our flaws that define us as humans, not being able to admit to having any does not strike me as a healthy and rational attitude.