After "Duffman" retires, Homer wins a reality competition to become his replacement. But his contract states that he cannot drink beer, which gives him a new perspective on alcohol.
When the actor playing Duffman retires through illness a replacement is sought through a TV contest and Homer wins. However when he sees the misery inflicted by alcoholism he tries to persuade the citizens of Springfield to drink non-alcoholic beer. This is not well-received and he is soon sacked from the job.—don @ minifie-1