I disagree. Terrible take. It's never wise to discount, alienate, or exclude our youth. Growth is the name of the game and they're the ones who are going to be ushering in hopefully a better future. Who will they learn from if not us? You want them stewing with each other?
No. We maintain whatever nebulous internet "culture" we like and establish rules. Anyone, young or old, who doesn't adhere can suck eggs. That way young people learn how to act and we can hear them tell us about all the ways we need to better society.
Truly I believe that the children who develop during this time of overstimulation and rapid technological advancement will emerge maybe a bit... maladapted but better than us. Humans can be so resilient especially under supportive circumstances. Our intelligence is adaptive. So if you want to make a great internet community, maintain your respect for our kids.