My doctor's nurse refused to take my blood pressure in both arms. She refused! She's black and I'm white. Why would she flat refuse to do it?

I have blood pressure problems as she could tell by looking at my chart. He's been my doctor for many years and we always take my blood pressure in both arms. I even asked her flat out if she was refusing to do that. She said yes. This has never happened before. Why was she behaving so bad to me?
My doctor's nurse refused to take my blood pressure in both arms. She refused! She's black and I'm white. Why would she flat refuse to do it?
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