Final answer:
The scenario provided portrays an example of heteronormativity, where heterosexual couples are expected to display affection in public while same-sex couples may feel uncomfortable due to societal prejudices.
Step-by-step explanation:
The given scenario is an example of heteronormativity. Heteronormativity is the belief that heterosexuality is the norm and that all individuals should adhere to conventional gender roles and behaviors based on their biological sex. In this case, Betty and Billy, as a heterosexual couple, felt comfortable displaying affection in public, while Danielle and Andrea, who are also married but of the same gender, felt uncomfortable due to societal expectations and prejudices surrounding same-sex relationships.