If you choose to believe her and her unnamed source, racism had nothing to do with it.
As per Lady C, Queen Elizabeth’s only daughter was concerned only about “cultural” differences.
Because Lady C’s clarifications bring an equally gigantic problem into focus.

In other words, multiple members of The Firm refused to embrace Markle as part of the family.
Did Lady C actually confirm Meghan Markle’s story?
Let’s recap, shall we?

The Firm, allegedly, failed to do anything.
Lady C’s claims raise another, uncomfortable question.
What is the “right” sort of American?
Evidently, not all Americans are “wrong.”
The Farish family is white.
Neither Preston, Simpson, nor Stark, of course, were avocado-loving California babes.