Yeah, sure, they aren't social in the same way you were. But you weren't social in the same ways your parents were either. Calling the younger generations antisocial because they've fully embraced technology as a core part of their identity smacks of patronism to me. Kids these days with their rock and roll, so antisocial!
That's the bit the old people don't understand.
Board games are fine, as would be video games in the same room as the other players. But online?
Note that the same worry would apply to a youth who spent all their free time reading alone in the past.
My high school apparently got complaints from neighboring homes that students were having sex in their bushes.
So, yes, changing social lives may be an issue, but it doesn't seem like it was easy before.
In my teenage years I played online games and had a group of online friends for years, some of which I am still in touch with regularly.
I don't understand how you get the boring bit though, partaking in outside activities does not make you interesting.
I think a lot of us deeply care about the future society that will cater to the people that are currently young. And it seems remarkably boring, superficial and for the lack of a better word, just devoid of anything fun.
In the end noone cares if this is a subculture (there were enough subcultures when I was in school i.e goths, metalheads etc), its more of a problem if this behaviour becomes uniform across all cultures and mainstream.