Every generation thinks they're better than the previous one and wiser than the following one. It happens literally every time
In many ways this is actually true though. See Flynn Effect
Internet adoption was so varied that you could have one millennial who didn't know what the internet was until they were in middle / high school, and another who hasn't know life without the internet at all. This creates a plethora of variances in life experiences for the millennial group.
As an older millennial I find myself in a strange position wherein I understand life before the internet but yet still am lost without it. I imagine this would be the same for any generation where a major technology was introduced e.g. typewriter / telephone.