What business does a teacher have giving kids any kind of beer...or anything to eat or drink?, unless there is an authorized, supervised school function of some sort. And even then I wouldn’t do it.
Would a teacher give the kids candy cigarettes? I don't think so. It's promoting habits associated with adult vices. The teacher should have known better. I believe it is cause for dismissal.
Man, how uptight we’ve gotten. Everything has to be super-official, for dread of the lawsuits and whiners (closely allied).
That said, maybe Green River would have been more fit, except for diabetics who could have Diet Green River.