Last time I checked, doctors in America for the most part do have the right to refuse to treat certain people depending on their state laws that they reside within. Morbidly obese livestock patients who refuse to follow the doctor's orders during their stay in their hospitals are often kicked out since their treatment plans are going nowhere due to their disobedience. Of course they have to prove that reasons on why they refuse to treat certain people mainly by citing that their disobedience to treatment plans despite going way beyond their means to help them only for them to fail.