A great example of this is the man beard. From when you are at school, we are told to shave our face. Why ? Is it because of "Presentation", people respect a clean shaven face because it looks clean. But this is everyone's bias opinion. But when you ask the five Whys, you find out that everyone has a bias against you having one. Because if you do have one then it will become a trend and you will become a trend setter and everyone will have a beard.