Some of this country is very white. Do you think the cops police them differently? That they treat poor white people with respect?

No, and they never have. They prey on the poor and most vulnerable. If there's a wealthy non-white community, they will always "get a pass".

A perfect example of this in action is the homeless. How do the cops treat the homeless? Are they kind and merciful to the white ones?

Are they racist? Many of them are, of course (and sexist, etc).

But they ALL prey on the impoverished by design.