"Hermione is a "caricature of what I was when I was 11."
-J K Rowling
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In interviews, JKR has described Hermione as being a slightly idealized version of herself. She also based Ron on a close friend of hers, Sean (to whom CoS is dedicated), and described pairing Ron and Hermione together as "
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" on her part. Some of her bullies are also based on her own bullies.
OT: Just take it as another version of the story. The story doesn't have that much diverse characters but it's not a big deal if they are doing it to make a point or to balance the characters out.
The only issue I see here is JKR's own comments in her interviews regarding the issues raise about the book. Be it Dumbledore's sexuality or the claim about Hermoine characters in the novel race never being ambiguous both are clearly shoe-horned in retroactively, and it thus come of as hollow claims. For we do not see those elements of characterization in the books themselves. It's going to be noticed and then people are going to take a side and that alone doesn't make them a racist. People are complaining about Sasuke and Hinata in the new manga because of change art style, aren't they.