Statists claim that robust egalitarian distributive norms only apply between the citizens of a common state. Attempts to defend this claim on nationalist grounds often appeal to the 'associative duties' that citizens owe one another in virtue of their shared national identity. In this paper I argue that the appeal to co-national associative duties in order to defend the statist thesis is unsuccessful. I first develop a credible theory of associative duties. I then argue that although the associative theory can explain why the members of a national community should abide by egalitarian norms, it cannot show that people have a duty to become or to continue as a member of a national community in the first place. The possibility that citizens might exercise their right to reject their national membership undermines the state's ability justifiably to coerce compliance with egalitarian distributive norms and, ultimately, the statist claim itself.