https://www.washingtonpost.com/national-security/2020/01/03/...
The US assassinated Soleimanis and Iran reponded with direct middle attacks on US bases:
https://en.m.wikipedia.org/wiki/Operation_Martyr_Soleimani
Iranian activity agains the US goes back decades and has escalated recently:
https://www.fdd.org/analysis/2025/06/19/iranian-and-iranian-...
Other than a brief thaw in relations in 2015 there is nothing that would suggest that Iran’s anti-US rhetoric is for domestic consumption and for show.