Anecdotally, the pronunciation popularity has split neatly along statewide-prominent political lines. For my four example states, three were correct/respectful, and one wrong/disrespectful.
Correct pronunciation has also had an inverse correlation with the rates of active/former military employment, which might be more directly indicative. And a positive correlation with education levels. So the answer is in there somewhere, I suspect.
National TV "news" programming might have a style guide which dictates pandering to the audience by speaking in real american, no matter how well-educated the hosts might be.
There is a VERY hard "I" that Lindsey Graham does. I think that's the specific version you're talking about, and that one is intentionally offputting. It's like "EYEEE RACK", but that does sound different from "AYERAK" or "EYEROQ".
The effete "ih-RAHN" is the NPR voice that you mentioned might get side-eyes. This is the closest to how Iranians that I know pronounce it, except that we don't have a phoneme quite like their R, which to my ears sounds like a D, L, and R all smashed together.
But these side-eyes are mostly fair, I think. It's like Americans prounouncing France as "Frawhce", or Paris as "Pahdee". Ostentatious and pretentious, for an English-speaker.
And Lindsey's provocative "EYE-ran" is very present in some locations, I think because GHWB and GWB's affected pronunciations were pounded into the American consciousness during Gulf Wars 1 and 2. Although Reagan did it too, IIRC, and I'm not sure about Clinton.