I think you're getting caught up in semantics here. If you want to tie this back to the 'actual racism' you're inferring, the prejudice of the US polity towards the Iran people is what enables this policy to be enacted without any serious counter of moral concern from the populous. This actual racism is what permits the foreign policy, that ruins the lives of innocent people in far off countries. Further to that, if someone is okay with their government using this tactic on the innocent people of one foreign country vs another, you can tease apart their actual racism from nationalism.