Severance, Peggy Olson says to Mathis: You want a raise, stop acting like a secretary.
Maidenform, Joan Holloway (at the time) says to Peggy: You want to be treated with respect, stop acting like a little girl.
Joan taught Peggy how to “act”, and for years, Peggy has taken in the lesson that success in business is about acting the way people want and need you to act. This lays the groundwork for Peggy’s conversation with Roger in Lost Horizon–Roger lets her know that she doesn’t have to “act” not-female. Meanwhile, in Lost Horizon, Joan tries to solve her problem by acting very female–and it backfires.
Of course, Joan’s thing about being a little girl isn’t confined to Peggy:
Roger Sterling: What happened to the Jewish doctor?
Joan Holloway: He’s not Jewish.
Roger: Not anymore, but he was, trust me. Is he still a doctor?
Joan: You sound like a little girl. What do you care?
—For Those Who Think Young (episode 2.01)