I am an American, and like close to half of my brethren, I am educated enough to know that Iran's democratically elected President was overthrown in a coup instigated primarily by the British and with heavy American involvement. I love how you lump all Americans into the category of "most brainwashed people in the world."
The fact of the matter is that during the Cold War both America and the Soviet Union used the developing world as a battleground for their proxy wars. Some were more direct (Vietnam, Korea, Afghanistan) and others much less so (Central America, Middle East, half the countries in Africa). America overthrew left leaning democracies that they saw as potentially becoming Soviet aligned and in their place put right wing dictatorships. The Soviet Union installed and supported numerous left leaning, but still authoritarian dictatorships. Now that the dust of the long Cold War has cleared, America is seen as the victor and also being responsible for all the damage that was done in the process.
This is not to justify what happened. In all these cases, like Guatemala and Iran, it was horrible what happened, and had the American people known what was being done covertly in their name they would have been horrified.
So here's the big difference: I can sit here and criticize my government and what they have done and speak out against it. I can run for office without being removed from the ballot by the Council of Guardians and the Supreme Leader. I can vote in an election if I don't like how my President has run up double digit inflation and made ridiculous denials of the Holocaust(despite the fact that most Iranians know it happened) and actually have my vote counted.
Iran is no longer a democracy, or even a semblance of one. If people in the developing world would stop making America the hegemonic boogeyman they make it out to be, and instead understand that it is a highly polarized country with a large contingent of people who believe in the international community, they might make some progress. Instead they just blame America for all of the world's problems, ignoring the fact that if the Soviet Union had conquered the world, they would live in states resembling East Germany of the 1980's.