There are all kinds of prejudices in nursing. There are new graduates who are out of nursing school or those that are transferring into a higher level unit who are bullied by the more experienced nurses, etc. I've seen older nurses set up and let go because of their age. I don't think color has anything to do with it. Many hospitals prefer male nurses and they actually get paid a higher starting rate than females. There is alot of prejudice in nursing but when you see this happening, there is a problem from the head down. The managers are allowing this to happen and turn a blind eye instead of taking a stance.
Don't let this discourage you. We are in the profession to care for the sick.
Let things go in one ear and out the other and if you need to address a problem, do it professionally and keep your cool at all times. Good Luck