The sound horeg—the use of powerful sound systems in public celebrations in East Java—has evolved from local entertainment to a contested symbol of class identity, taste, and public morality in Indonesia. This study analyzes how the digital public interprets and discusses this phenomenon through social media comments. Using qualitative digital ethnography and computational text analysis, 1,000 Instagram comments on a viral sonorous horeg video were examined. Sentiment and theme analysis revealed three main orientations: admiration and cultural pride, moral and class-based rejection, and ambivalence between cultural expression and civic order. Negative sentiment predominates (8.7%), reflecting a strong moral charge in the discourse. The results show that social media acts as a space for moral regulation and identity negotiation. Theoretically, the study extends the notion of subculture and affective publics to the sonic and digital realm.