If prejudice means pre judgment ergo judging a thing before we know it, then humans do those things automatically all the time.
That is how we can function without looking at every blade of grass or every pebble in the desert.
We just assume all grass is same, until we are confronted with evidence that there is a blade of grass that is different.
We prejudge the grass as we know it.
Does that mean we actually are wrong about the grass?
Well we know the grass exists.
Well actually grass does not exist.
There is no such thing as grass.
We conceptualize grass as grass.
Grass does not know we call it grass. Its a mental construct we created.
We know grass exists, but the concept and the way we perceive grass is limited to our way of experiencing grass.
Our brains can only deal with reality by filtering out stuff, and then focusing on few things.
Those things are either real or not real.
We can certainly be wrong about existence of things.
Good example is aliens.
There are literally millions of ideas in fiction about those and we have all types of concepts about them.
We have both concepts of aliens that are hostile, or even malevolent, to aliens that are nice or benevolent.
We also have space operas where there are entire planets and species of aliens of different types and personalities, and qualities.
