am I the immature one?

this has been eating at me since this happened. My friend was on the bus talking about all her favorite alcoholic drinks, listing off all the different ones shes had and where she was when she had them. She was like "... i was soooo drunk.." so i told her that i thought she was being immature getting drunk at 14 years old and she was like " im the immature one? but your the one who doesn't drink" I know alcohol can be damaging to your brain if its not done developing and even though we're not close anymore i dont wanna see her get hurt, but do i need to loosen up? is it not a problem to binge drink 3 out of 5 school nights? I just found out recently her and a few of her other friends go out all the time with just getting drunk in mind and i've seen them come into school with hangovers for days in a row and their grades dropped rapidly. But maybe the grade were just unrelated? maybe they're just distacted by a boy or their just not good at school work? do i need to let this go?