The answer is simple: Lazy thinking.
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Also, please see The Backside of American History
You'll love this 187 page .pdf (1.99 MB)
Yes, I do agree that it is lazy thinking...
Both my husbands family and my family, came from very prejudiced upbringings...I see it in my moms relatives and in my husbands relatives...Fortunately for me, being prejudiced was revolting to my mom, and she raised us with her own set of values, which were directly opposite of how she was raised...and it was really quite difficult for her at times...she was not a highly educated woman, not smart in what people would call the ways of the world, but she did know how to treat people individually, based on how they behaved, not the color they happened to be born with...she did know right from wrong...I am grateful she was able to pass that on to me and my brother, ,and teach my dad a thing or two(he also came from an extremely prejudiced thinking family)....