Mossedeq tried to overthrow the constitutional monarchy and usurp power. And the Islamists didn’t like the socialists.
No matter how one thinks of Mossedeq, he was democratically elected under their constitution and we overthrew him. This was a sovereign state and we controlled it effectively for 25+ years. Is it really at all surprising to anyone that by 1979 we would not be seen as anything but the bad guys by the Iranian people? We had no business, or right for that matter, to go into Iran and actually implement a coup to overthrow their elected leaders. People don't like it, but we made that bed and we are now lying in it.
Don't confuse their little fantasy with reality.
After all, in their world if an ally asks us for help we should never give it.