Text: People who did move to the suburbs had to obey an unwritten conversational rule that you had to justify it in stagy and fake terms, either by exaggerating the hellishness of the city for children or by pretending that the suburbs were really not that far away and had lots of great Korean groceries.
Entailment: People living in the suburbs had to obey an unwritten conversational rule, that you had to justify it in fake and stagy terms, either by exaggerating the hellishness of the city or by pretending that the suburbs were really not that far away and had lots of great Korean groceries.
Contradiction: People moving to the suburbs never had to obey any unwritten rules, they could be honest about their reasons.