You have not really disproven most of the more recent issues he brought up. The US (and Britain) did have a big hand in the struggle that culminated in the Iranian revolution: for fear of getting a USSR ally, they got a completely out-of-control regime and then have fought it with the dirtiest tricks they could muster ever since. Sure, nobody is fully innocent, but that doesn't justify acting like a c*nt in return; it actually justifies blaming "the big bad West" and helping the worst sectors of Iranian society. Isolation always helps this sort of regime, see also: fascist Italy, socialist Cuba and so on.