spath - we're not saying it's the colour of their skin that defines a person's behaviour; the skin colour is just one of the features that enables us to identify a group of people and it's a very obvious feature that's not easily changed. You can dye ginger hair, straighten curly hair, change shape of noses etc but skin colour is very difficult to change. What we are saying is that we perceive that certain groups of people tend to have common behaviour patterns; what we must NOT do is to assume that ALL people in a group behave in the same way because that is racist.
Incidentally, something cannot be fairly unique or very unique; unique is binary, so something is either unique or it is not unique.