I must have been born in a different generation (and perhaps social grouping) to many on here. MissA I don't often disagree with you, but I'm not at all sure what you mean by your reference to folks from council estates cos lots of my friends in the 60s lived there, and most were perfectly nice kids.
I drank alcohol far earlier than I should have done, but not to excess, and have no idea if my parents knew (although they always seemed to know everything else about me!). I sang in a Folk Group which played in the local pubs (well before I was 16) and such music was always a big part of my life.
My entire family drank alcohol. My GD was a pub pianist and was "paid" in free pints.
I didn't taste wine till well into my 20s (it simply didn't exist in my social circle), and have always enjoyed it. Yes, there have been times when I have drunk more than I should (stress, social circle etc.) but curbed it well for many years. I now only drink low alcohol stuff. Even in the years that I drank too much I was never drunk. My DD used to joke that when he was courting my DM he could never have his wicked way with her till they were married cos six whiskies had no effect on her!!!
My DDs both experimented with alcohol in their teens. It didn't bother me cos I knew it was a phase and could have been a phase of a much more serious kind (yes, I knew several experimenters with drugs in the 1960s - I never even smoked a joint). My DDs hardly drink at all now, usually something "novel" like spritzers. My eldest DD has two almost-teenagers and she and her DH are the best parents on earth. Her DH was a "typical teenage boozer" having a bunch of friends in the Police Force (not meant to be prejudiced!). So far I'm not aware that either of the kids have been offered alcohol, and if they are I consider it none of my business and really not too bad a thing in the grand scheme of things that can go wrong with teenagers.
My DH's dad was a staunch Methodist and his first encounter with a pub was in his 60s and he expected to see sawdust and spitoons! He chose to drink a sherry and knocked an entire schooner back in one. Three sherries later and he had to be taken home. What an embarrassment that was. He was the youngest of eight children so no idea how he reached that age without having had a drink or two.
Of course there is no guarantee that how kids are brought up will encourage or prevent bad habits as adults, but I wouldn't have thought a couple of shandies ever week was an issue.