In 1953 we overthrough the elected leader of Iran because he was going to nationalize THEIR oil fields. We (together with Great Brittain) installed the murderous dictator Pahlavi (aka the Shah).
https://en.m.wikipedia.org/wiki/1953_Iranian_coup_d'%C3%A9tat
In the 1980 -1988 Iran/iraq war we gave support to Saddam Hussein in
The conflict. 500,000 people were killed in the conflict, the majority were Iranian.
https://en.m.wikipedia.org/wiki/Iran%E2%80%93Iraq_War
In 1988 We shot down an Iranian civilian airliner by the USS Vincennes in the Persian Gulf. All 290 people aboard were killed.
https://en.m.wikipedia.org/wiki/Iran_Air_Flight_655
In 2015 the US including a multinational coalition, made a comprehensive deal with Iran to lift sanctions in exchange for the abandonment of Nuclear weopons programs by Iran.
https://en.m.wikipedia.org/wiki/Joint_Comprehensive_Plan_of_Action
Trump promptly ripped up the agreement when he became president in his first term because reasons. Now Trump wants to bomb Iran because Netanyahu and because he was humiliated by his pathetic military birtday parade.
Yes the Iranian people are pissed at us and they very well should be.