I agree and disagree with a lot of the posts here. I can see that there are situations where the use of tablets etc are helpful but i also feel that there are situations where children should be encouraged to socialise more (abilities permitting).
I just wanted to say that I've had (young) adult dinner guests (in early 20s-old enough to know better) come to my house, plug their phones in and think that because they are contributing a comment here and there that they are actively participating in conversation. It's plain rude. I am often the only person in a room NOT on my phone (YES in social settings, not on a train etc) and I'm by no means a social butterfly (anxiety/social disorders).
Granted that I'm not saying kids who grow up with tablets at a restaurant late at night will turn into these rude adults, and many kids who watch a lot of tv dont need it later in life, but technology addiction at the expense of social etiquette IS real and it is beyond frustrating to deal with as an outsider to it all.
Maybe it is (sadly) just how the world is now but I'll be damned before I'm a part of what i perceive to be the problem.
So yes, i understand OPs frustrations.