I wonder whether anyone else has noticed this phenomenon... I find it really quite odd... I suppose it'd even be interesting if I were a sociologist rather than a mother... 
I'm solidly 'middle class': university educated, working in a professional job; my house is full of books and I don't watch much TV; my leisure activities - tho' limited by being a single parent with a part-time income - are things like dinner with friends, films and occasionally the theatre, a bit of swimming; we haven't been abroad for a couple of years, but we have weeks and weekends away in places like Wales and the Yorkshire coast...
My younger son (12) does what you'd expect a son in such a family to do: he's successful at school and pleasant to talk to; he's a bit of a geek, but a sociable one; he goes to science club and archery; he can play a bit of piano and he's an impressive film buff (even beginning to know about French cinema!); he whittles and draws, and though he's a whiz on a computer, he can entertain himself happily without screens...
My teenage son (17), on the other hand, wants nothing to do with any of this. Like most teens, he thinks he's been born into the wrong family...
He spends his time in bed or on the sofa, watching TV or playing video games, or hanging around on street corners, or a nearby housing estate, or elsewhere, Doing Nothing with other teenagers (mostly boys). He does no organised activity, and refuses to join in with any 'family' trips or activities. He's bright but not interested in studying, so he obviously underachieves - and he doesn't have any ideas about what else to do either. Many of his 'mates' have been excluded from school, or have left it without finding anything else to do. They don't work, and nor does my son (tho' he has done the occasional bit of cash-in-hand casual work). He smokes dope and takes M-Cat at (I think) weekends. He has no plans and no aspirations.
He expresses views and acts in ways he knows I find intolerable: he has stolen money from me, and behaved badly and violently enough that I have called the police on him on three occasions ("what sort of mum calls the police on her own son?"); he won't do chores at home ("that's what mums do"); he won't consider volunteering ("I don't even want to work, so why would I work for free?)... (It's going to be a lonnnnnnnnnnnnnnng summer :( )
I'm not a pushy parent (perhaps I should have been more hard-line) and obviously many kids are inclined to reject their upbringing and their parents' values... But it feels like he is choosing a life that won't amount to much, and it's very hard to watch and live with...
I don't know if this cultural reference will mean anything to others, but I often feel like I live an 'Archers life' somewhere like Ambridge, and he lives a 'Shameless' life somewhere like the Chatsworth Estate.
There's a lot of talk about giving young people opportunities for better 'social mobility', but I'm pretty sure The Powers That Be intend this to support kids to move upwards, not downwards!
Does anyone else have a child who seems determined to be 'downwardly mobile'... Or (I live in hope) one who's been through that stage and come out the other side?!