In your Animal Crossing Bells original post you spoke about defending the identity based on years of undergoing oppression, which is totally legit. But that's how the event that contributed to this occurred.
It's like that video where that woman attacks a man with dreadlocks while saying"stop appropriating my culture" over and over again. People made the same comments like you did, but the truth is, she did not give him a very long speech about how she understands that dreadlocks are shared across the world, but she is still sensitive to it seeing white people with guards, because for quite a very long time black people are told that they're dirty and do not seem like real people unless they straighten their hair.
No, rather she was grinning while assaulting him was an arrogant piece of shit. If you want to talk about the nuance of a situation, then you have not be ignorant yourself. The nuance is not a shield you can just slide under the door once you have acted like a whole bully.
Also, what ethnic significance do hair buns, which have been common across the planet have in this respect? I am really reminded of the Chinese apparel dilemma, in which twitter bullied a white woman wearing it, for precisely the same"you do not understand the cultural significance" reason, before the actual Chinese country accounts on twitter(iirc) told me that it is totally nice and she looks terrific.
I will begin buy Animal Crossing New Horizons Nook Miles Ticket with your final point which is to say that I believe the post was specifically referring to an afro bun. Hence that the afro part is what is being appropriated.