I think all physicians can be biase. All though they have to take an oath and are professional, they all are human and are biased without knowing. You don't have to be trained to not be biased, it's in our nature whether you like it or not. It would take years to learn how not to be biased because your brain doesn't know other wise.
Everyone is biased in one way or another, despite their best efforts to keep those thoughts out of the way. Whether it be a court justice or a physician, it cannot be ruled out. Personally, I think what affects a person's prejudice or bias has more to do with how they were brought up during their early days, rather than education. Although both can surely have a significant effect, humans learn from their parents and the people around them, rather, we copy their attitudes and ways of being.
Although the medical profession strives for equal treatment of all patients, disparities in health care are prevalent. Cultural stereotypes may not be consciously endorsed, but their mere existence influences how information about an individual is processed and leads to unintended biases in decision-making, so called “implicit bias”. All of society is susceptible to these biases, including physicians. Research suggests that implicit bias may contribute to health care disparities by shaping physician behavior and producing differences in medical treatment along the lines of race, ethnicity, gender or other characteristics.
Biases and stereotypes are a result of natural cognitive processes. Every human has them, even doctors. We naturally categorize things and stereotype groups. Everyone has their own biases and prejudices based on these categorizations and stereotypes. We tend to favor people who are in the same groups as us, while disliking and stereotyping people in our outgroups. Education can help reduce this problem, so since doctors are highly educated, perhaps they tend to have fewer biases and prejudices than the average person, but it's very hard to get rid of them completely.
Part of being certified as a Physician involves the taking of an Oath to provide medical services. Therefore, physicians, in their medical positions should not have biases and prejudices if they have taken the oath to help all people. They are trained as medical professionals and it is their job to be available to treat their patients.
I do believe that everyone may have prejudices and may be biased but when it comes to helping save someone's life it shouldn't matter if you have prejudice towards them, they have come to you for help. You should do your job and help anyone in need. Yes everyone has an opinion but it shouldn't decide on weather or not you help this person that is in need.