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"Ever since slavery, it's been both vilified and fetishized as the most singular of all black female features"
Apparently the fetish continues. Just because you've decided it is now a symbol of something positive, doesn't mean you aren't still reducing Michelle to a piece of meat and a caricature of her race.
The world will be a better place when people can get past focusing of physical appearance and instead look to the ideas and actions of the person. "Not by the shape of her ass, but by the content of her character" - to paraphrase a famous expert on the subject of equality.