In this context, "body positivity" becomes performative. You might post a #BodyPositive selfie, but still panic when a partner sees your cellulite in harsh lighting. You might love your curves in a high-waisted bikini, but feel terror at the idea of a communal changing room.
In a textile-centric (clothing-required) society, nudity is often hidden or reserved for sexual contexts. This creates a vacuum where people only see "perfect" bodies in media, leading to insecurity about their own "imperfections" (stretch marks, scars, asymmetry). In this context, "body positivity" becomes performative