I guess Rava didn’t know the halacha about not drinking on Purim…
Back in the day, people drank on a daily basis. Bochurim having some beer with their thursday/friday night chulent is not the end of the world.
I did hear a story from somebody that they were walking and heard a bochur crying cuz his mother was throwing hot beer on him, but it was really just a message from shamayim warning us that the best way to be mechanech our youth is to try to drive them away with scary stories.