A lot of those people are actually ultra-racist, which is why they emphasize Persian. They hate Iranian Lurs, Balochis, Turks, Arabs, Kurds. They hate their American/Western counterparts too. And don't gt them started on Black people.

They're just racists who think they're the top White race, true Aryans.

Normal Iranians are not like that. Iran is multi-ethnic and multi-cultural by history as well as by its National myth.