As Darius sees Yazd for himself, he realizes that both he and Trent have been ignorant about what Iran is really like. Cacti are native to the Americas, for one, and many Iranian cities are modern. Introducing readers to the
taarof practice helps Darius explain one more way that he feels less Persian, as taarofing isn’t something Americans really do. However, not being skilled when it comes to a taarof doesn’t actually make Darius less Persian: it just reflects that he was raised in the United States.