This, this and 100% this. I had kids before a lot of my friends, and when social media was really not much of a thing, so to a large extent I escaped a lot of the comparison stuff. But as we got older and more started having kids, it became really apparent how much I felt judged, and how much I judged other people. I think it all comes from the need to feel like your actions are justified. No one wants to feel like a bad parent, so it's easier to just indulge in criticism than introspection. I suspect all parents are guilty of that to an extent when it comes to our parenting. But doesn't mean we're not all trying our level best with the skills, knowledge and life experiences we're bringing to the table.