One of the points of the episode is the huge difference between Junko and Ai. And that difference is the way an idol approached their fans. Junko comes from the Showa era (1926-1989) and in the times in which Junko lived (Early 80s) the idol - fan interaction was somewhat distant while the story of Ai being from the Heisei era (1989-2019) is that of an Idol in the early social media age (Late 2000s), a total interaction with the fans. Something Junko is not familiar with.