I believe that I have run across a dilemma.  For some reason, lying here in my bed I have begun to think about biases.
Take for example the facetious bias of “White men can’t jump”, just for examples sake…it’s the title of a movie and a pretty laughable well know ‘bias’ that seems to occur at random, in gymnasiums everywhere I go.

Let’s obviously assume that I actually believe this.

Now, where did I get this bias?  Where did it come from?  How did I come to have it?  One apparent way that this happened is because someone gave it to me.  So, under what conditions must I have received this bias?
Some must have passed it along to me.  I must trust this person, or at least hold them as a source of some merit; otherwise I would have no motivation to take seriously what they say.  Or, perhaps I would have a notion of it already.  Or, I have heard this information from many unreliable sources, and form the group opinion to my own.  In any case, this is all a result from receiving this bias from other people.  This is not what I’m after.  I’m curious about how biases arrive in the first place.
So, how is that an individual would go about arriving at a bias on his own?