Airbrushed reality?

I love scrolling through people's photos on Instagram, enjoying the fabulous landscapes, happy faces, and interesting looking food. Doing so this morning I found myself thinking of those who sneer at what is often dismissed as airbrushed reality. The judgemental tone with which they deride what they see as a tendency to only show the good bits of our lives on social media.

My own experience is different. The people I follow do tend to talk about the ups and downs of life. But even if they did want to share only the good bits - why the hell not? Isn't the real problem jealousy on the part of those who make this an issue?