That's how you get drunk people once they're free to buy alcohol. Parents should help their children discover alcohol safely at home so it is not some mystical drink you can't wait to get your hands on. A glass of good wine here and there during family reunions, one or two beers with the barbecue, maybe some whiskey and vodka to learn what the good stuff tastes like. Suddenly it becomes "this drink with a special taste which gives you a light buzz".
For the dating part, I think this is tied up with the insecurity of kids nowadays. There is a lot of competition, the TV/internet is bombarding us with beauty ideals and perfect relationships. It is easy to give up and convince yourself that you'll be "forever alone". There are even communities online, where kids with no relationships hang out. And the longer they wait, the harder it gets for them to start a relationship.
IMHO the kids need to find a way to bite the bullet and be social.
Then do it again anyway because you forgot the hangovers.
This meme needs to die, it has no basis in reality.