B: Why are you hanging onto the hem of my coat?
L: Because I'm small and afraid of getting lost in a crowd.
While Lydia's rationalization makes perfect sense in abstract, in the context of not having a crowd to get lost in, her rationalization is entirely misdirected. The sentence of explanation that precedes the sample dialogue contratextualizes.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi