It's similar to that Animal Crossing Bells video in which that girl attacks a man with dreadlocks while stating"stop appropriating my civilization" over and over again. People made the same comments like you did, but the fact is, she did not give him a long speech about how she understands that dreadlocks have been shared across the world, but she's still sensitive to it seeing white people with locks, because for quite a long time black individuals have been told they're filthy and do not seem like actual people unless they straighten their hair.
No, rather she was smiling while attacking him and was an arrogant piece of shit. If you want to talk about the nuance of a circumstance, then you have not be ignorant yourself. The nuance is not a shield you can just slide under the door once you've acted like a whole bully.
Also, what cultural significance do hair buns, that are common across the planet have in this respect? I am really reminded of the Chinese dress issue, where twitter bullied a white girl wearing it, to get precisely the same"you don't know the cultural significance" motive, until the actual Chinese state accounts on twitter(iirc) told me that it's completely fine and she looks terrific.
I will start with your last point that's to say that I believe the post was especially referring to a afro bun. Hence the afro part is what's being appropriated.
For the other point, I'm not defending her actions, I'm explaining why she might be angry. And maybe has tried to describe previously and folks just didn't get it and she got tired of reexplaining. Or perhaps she doesn't understand her own anger enough to voice it so she lashes out in anger. Or perhaps she is just a terrible person using this talking point as a opportunity to go off on someone. I can not say for certain all I am trying to convey is that articles like this get passed around as an endeavor to reveal liberal hypocrisy or to show how"All these SJWs are terrible men and women!!" . My point is she does Cheap Nook Miles Ticket not represent the core beliefs that these people hold, just that she is lashing out in anger.