I think I have answered this question before, if it was not asked by you...
I think we all have a bunch of prejudices ourselves, without realizing the fact that we have them and yet we think others are wrong or have prejudices, it's not merely about a person/like others' personalities mostly, but about everything.
What gets us in trouble is not what we don't know. It's what we know for sure that just ain't so. --- Mark Twain