Especially with the internet, it's easier than ever to shut yourself in and never go out into the real world and have real meaningful interactions, while still feeling like your online life is full of real, meaningful interactions. Just immerse yourself into a sub-community filled with 2k people, and you feel like a social butterfly.
And it's not just social lives. Things like learning how to interact in basic ways with your cashier at the store, or how to make new friends outside of work, so many of us just don't know how to do this, because our heads were in The Cloud™s while we texted and browsed reddit in line at the grocery store.
Things have even changed profoundly within a single generation. When I was in school, Tamagotchis were the thing. When my little brother was in school, his teacher was using YouTube to teach them. Now my son is in high school and all his classmates have Android phones, which are such a game changer that they aren't even allowed to even have them turned on in school.
And going back a little further, my oldest son and daughter have The Dangerous Book for Boys and The Daring Book for Girls which teach stuff that 100 years ago everyone knew, and now you need to buy novelty books to learn, despite many of the skills and tricks these books teach still being useful.