[scribu]

What humans think they know is not actually reality - fine.

But then what's the difference between a fact and a stereotype, in your opinion?

[pharrington]

Not answering for the parent: a fact is any instantaneous snapshot of reality. A stereotype is misapplying properties of specific and limited context to a universal scope.

[andreasvc]

A fact is a statement corresponding with reality, a stereotype is a belief/generalization deemed harmful/undesirable.