This study examines the relationship between code-switching (CS) experience, as measured by the Bilingual Code-Switching Profile (BCSP), and ratings from an acceptability judgment task (AJT). Although the BCSP offers a structured way to quantify bilinguals’ CS behavior, its application in grammaticality studies and its ability to reflect bilingual heterogeneity have been underexamined. We address this by asking: (1) How do BCSP scores predict acceptability ratings of Spanish–English CS sentences? and (2) How do BCSP scores reflect the social heterogeneity of US bilingual populations, focusing on age, gender, region, place of birth, and national origin? A total of 137 Latinx bilinguals across the USA completed an online survey including the BCSP and 40 reggaetón-inspired CS sentences, balanced for grammaticality and experimental label (i.e., Source: Reggaetón lyrics). Results from multilevel and linear regression models indicate that higher BCSP scores are associated with higher AJT ratings, particularly among participants who report frequent CS use, greater proficiency, and positive attitudes. Social variables had limited impact, although age and place of birth emerged as modest predictors. These findings highlight the BCSP’s value in capturing CS experience and stress the need to account for bilingual variability in studies of acceptability judgments.