For Don, the conflict of the episode is about intimacy; revealing who he is and sharing that with another human being. For Peggy, the conflict is about who she is expected to be: men’s room or ladies room, career or marriage, what she wants versus what’s expected of her, dinner with Mark or work late.
Speaking of the ladies room, here’s what happens in it:
Megan: How old are you?
Peggy: 26. Today.
Megan: Well you’re doing all right, aren’t you?
Megan is impressed. As a career woman, Peggy’s come pretty far for 26, and Megan, who also has a career, can see that.
Then Trudy comes in. Wham! Slammed with pregnancy right between the eyes!
As they leave the ladies room, Trudy says:
You know, 26 is still very young.
Oh, sure, Trudy meant well. Maybe. (Maybe not, because she’s heard enough about Peggy to assume she’s witty and know it’s her birthday, so maybe Pete goes on about her a little more than Trudy is comfortable with.) But it was a cutting remark; patronizing, “comforting.” Peggy hasn’t gotten anywhere at all, as far as Trudy is concerned, despite her advanced age. Peggy doesn’t have a husband or a fiance or a baby. Trudy is being reassuring.
No wonder Peggy chose the men’s room.