A good chunk of the Iranian diaspora are the old supporters of the monarchy. Under the Shah Iran and Israel were allies. Also a lot of Iranians are strongly racist against Arabs. The fact that a lot of Arabs killed family members, when Iraq invaded them in 1980 and an eight year long bloody war followed, certainly does not help.

Not saying Israels genocide is a good thing, but the Iranian diaspora is probably a bad gauge to judge Iran by.