What’s the most unprofessional thing a doctor has ever said to you?

When I went to visit one of my friend from EP in the hospital who had problem with kidneys. He was not in the ward when I reached hospital, they had taken him for chest X-ray. When he came back I asked the doctor who prescribed the X-ray that what was the need to do X-ray. He told me because we want to check if any infection is present. I told him that you have already done blood tests and the TLC and DLC are normal that means the body has no infections and the patient doesn't have any symptoms, then what is the need to know where is infection? He was speechless.