Why Do People Judge Us Based On Skin Color?

Im not sure where this came from but everything right from creation has been assumed to be of white culture for example you would imagine adam and eve to be white right? this may sound racist but its a stereotype that has just kind of stuck. i dont care about skin colour either. whether your white black orange brown whatever. we are all the same. infact one of my best friends is black but i treat her like any other person. it would be so weird to treat hre any other way. i think the whole stereotype thing with adam and eve and bba baa black sheep is just so stupid