That being said, most of it was "cool parents" that allowed such behavior because we didn't own anything as teens.
We would have rules like, if you're drinking there, you have to stay the night or call your parents to pick you up.
I think it was just a different time; it seemed more forgiving. Now, a cop will pull you over and give you a DUI and mess up your life for a while. But I heard stories back then ~ '70s, where cops would make sure a drunk person got home safely at night instead of throwing the book at them.
I am sure it is harder for kids today who mostly live online in their algorithmic bubbles. And harder for parents to condone such activity, because who wants to be the parent where cops come knocking on your door and charge you with supplying alcohol to minors?