Studies on nationalism have recently transitioned from macro-level analyses of large structural factors to micro-level examinations, emphasizing nationalism as a set of cultural and political beliefs held by individuals. Such works that use opinion measures to explore heterogeneity in national self-understandings show that nationalist beliefs distribute among the public in particular and non-random ways, though the extent to which these heterogeneities induce variation in behavioural outcomes remains relatively unexplored. In this article, we argue that varying conceptions of nationhood inform ethnonational boundary-making strategies and social action. Using latent class analyses and a resource allocation task in original representative survey data (N = 1,460), we ask whether varying cultural positions on nationhood covaries with preferential behaviour. We found that nationalist cultural models provide heterogeneous cultural templates and lead to preferential treatment of ethnonational ingroups.