I don't know if it's accurate to say that they hated Slavs more than Jews. It's important to remember that, proportionally speaking the amount of Slavs killed would have been less than the number of Jews killed even if the raw number was greater. The Poles certainly fared far better under the Nazis than did the Jews.
Of course, the Poles were Catholic. It's possible (and wouldn't surprise me) if Germany had a particular ire against Orthodoxy as well. I really ought to read up on it some more.
Anyway, from a moral standpoint, it hardly matters. Even if we grant that the Slavs fared slightly better than the Jews under the Nazi regime, to call them "privileged" would be akin to calling the Jews under the Ottomans "privileged" because they were tormented slightly less than the Christians.
The funny thing is that Slavs are more likely to be blonde hair and blue eyes, more so then the Germans.
Maybe they were jealous. :)
As for Nazis wanting to ally with the Persians, that does not surprise me. Iran is Farsi for Aryan. I know many Nazis fled to Iran after World War II. I believe mostly SS and Nazis collbarators.