We and most of the parents we know probably spend more time talking about the crappy bits of parenting than how awesome our kids are. The single best part of doing anti-natal classes was meeting a small group of people who were all going through the same kinds of stuff we were. Knowing "It's not just me" is a really big help coping with some of the tougher stuff.
We do still talk about the good stuff, but we all know they are awesome.
Thankfully most of my FB friends are pretty light on the performative parent posting. The ones who go in for that also tend to be the one who overdo the posting generally.