Is prejudice really about race or has it always been about power or money or both.

I was answering another question today and I realized that bigotry may have more to do with keeping someone down to keep your elavated position in life. Whether it be, money, intelligence, or power.
How else will someone be able to feel superior unless they can find someone to feel superior too? I always felt it was just ignorance but now I’m beginning to wonder if it comes from a need just to be top dog. I started to think of all the very lay back (not lazy) people I know, and I realize that they are the least biased people I know. Extemely content in their lives they have no reason to feel biased towards anyone.
Would you agree or do you simply think it comes from lack of knowledge?
By the way. Not looking to start anything. Simply was wondering about this and figured some flutherites may come up with some good arguements for or against my statement.
Please try to explain your reasons beyond yes or no. Thanks.