The post would have been just as effective without that oddly phrased phrase. It is a strange jab at "whiteness" which, I think, reveals the general attitude of the people running the company. Personally I think they should remove that sentence. It isn't a good look.
This reductionism seems like identity politics at its worst. It sounds like you're saying that anyone who identifies as white (regardless of how arbitrary this race is) must avoid using a term you find disrespectful to describe their race, and doing otherwise means that they are hating themselves?
> "and we have no interest in living in a sea of mayonnaise."
What is that even supposed to mean?? Who refers to people as "mayonnaise"?? While claiming to be against racism??