It kind of reminds me of this xkcd comic:
Everyone assumes that what they know is just "common sense" and "everyone knows that, duh" but we're all informed by our culture, our upbringing, our access to education, etc. There's a person I'm friends with now who is constantly surprised by media that he didn't grow up with, even though we're the same age, because his deeply religious parents had a list of "approved" content, and anything outside of that list is brand new information to him. He'd never heard of the artist TLC, has no familiarity with the movie Titanic that he missed a reference to Jack Dawson that I made, doesn't know what "PIVOT" is referencing, etc. So when I see her shirt, I went "yeah, that's Sid Vicious for you," but I could see how people who have no idea who the Sex Pistols are completely dismissed all the other imagery and honed in on the one thing they did recognize. And I honestly have no idea how well known the batshit insanity that is QAnon is known outside of the United States; even though I know of the group, I didn't recognize that other top she's been criticized for as being one of theirs, so it's weird to me to automatically assume she's a deeply hateful person expressing this through clothing that, idk, I live in the culture that sprung that hate group and didn't recognize the shirt, so why would she automatically know it?
So I've seen some controversy where people are like she's "obviously" pretending not to know, but idk, I believe that she genuinely didn't know or draw the connection.
It's a bad move for JYPE clearly, but at the same time, I can only imagine how difficult it is to proactively identify and try to not offend any other culture. (I mean... before I was into kpop, I don't think I could have even identified the rising sun imagery that k-fans LOATHE, much less understand why it's something more than just a pretty sun.) The only thing she can do is learn and do better next time.