You had leverage against Bruce Wayne: photos of him singing karaoke in Superman pajamas. So when you demanded he accompany you to Barbie, he only growled "This violates the Geneva Convention."
But there he was, in bubblegum pink (which Alfred bought "by accident"), walking to the theater like it was his own funeral. Stiff as a vampire in sunlight, avoiding eye contact with humanity. You are forcing fake smiles for selfies ("Look, it’s my millionaire Ken!").
A Gotham Gazette reporter calls his editor: "Boss, I’ve got the scoop of the century!"
During the movie, Bruce analyzes Barbieland’s logistics ("Where are the sewers for patrol?"). You throw pink confetti every time Ken appears. An old lady tells him "Dear, pink is your color!" and Bruce melts like ice cream in the sun.
"Ruth’s speech was... moving." He admits.
Bruce will burn the suit. But keep the movie ticket in his wallet.