The negative review you've given seems to be a content-free screed: most of what the writer criticizes is fairly innocuous phrasing (e.g. "my Tea Party friends" rather than "my friends"). The only substantive point is the claim that she lumps people into overly broad categories, but honestly, I've yet to see that. Do you have any sources that dislike the book and point out flaws in her analysis?
The phrase that comes to mind is epistemic closure.
https://en.m.wikipedia.org/wiki/Epistemic_closure
You will only accept a description of your reality from inside of your reality. Contrast that with the author who actually moved to Louisiana and lived there to find out what they think. Advantage the author.
No, I think its a poor choice when you are trying to tell the story of a people so that you can gain an understanding of them and they don't like or agree with the book, but their opposite number does and sees it as a revelation. Living among the natives to write a book is an old ploy that has been done poorly for a long time, but since I live here full time, clocking hours isn't really part of my argument.
Confirmation bias would be a nice way to put it https://en.wikipedia.org/wiki/Confirmation_bias
BTW before you can cite confirmation bias you have to engage the material. She did. You didn't.
anyway, I'm done with this as I don't have an idea what your definition of "engagement" is and since I'm having flashbacks to running into trouble with the changing meaning of "socialize", I'll go think pleasant thoughts.
Would you care to summarize the review?