Why do white Americans dislike being called European American?

That is what they are

American is their nationality and citizenship but their ancestry dna is still European. White skin is a European gene. Blue eyes which many American born people have is also a European gene.

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I believe if the white Americans did ancestral dna test they would still get European percentages and if the black Americans did the ancestry dna tests they would still get African percentages
Why do white Americans dislike being called European American?
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