This response memo offers a critical reassessment of the claim that ideological self-placement in Chile reflects a form of social identity. While the article under discussion provides compelling evidence of ideological stability, it risks conflating political linkage with social identity formation. In contexts of partisan decline, such as Chile’s post-authoritarian landscape, ideological categories may persist not as thick communal identities but as affective rejection fields. Drawing on insights from political psychology and Latin American party system research, this memo proposes an alternative hypothesis: ideological stability is structured by negative partisan identities—emotionally charged, ideologically coherent rejections that shape voter behavior without requiring strong organizational anchors. A stylized conceptual map illustrates the geometry of rejection in Chile’s political space. These affective coordinates help explain voter alignment in the absence of coherent in-groups or traditional parties. While preliminary, this framework underscores the importance of moving beyond ideological self-placement as a proxy for social identity and calls for renewed attention to the emotional architecture of opposition. In doing so, it invites a broader research agenda on how negative partisanship operates across fragmented democracies in Latin America.