Blacks that rush NPC

[DSTCHAOS]

Originally Posted by PANTHERTEKE

So, you would raise an eyebrow at Molly Minority because she was raised in a predominantly White neighborhood, went to predominantly White schools, had mostly White friends, and decided to join ABC NPC org?

What do "predominantly" and "mostly" mean as it relates to not being used to being around black people or not being able to relate to black people?