I don't think the grandparent quite expressed themselves clearly. If there is a group of applicants who happen to be equally qualified, but one type of person in that group is more likely to actually get hired - it's not reasonable to say that hiring a different type of person is taking an opportunity away from a member of the more popular type of person. A black woman getting hired isn't "taking a job away" from a white man. She's qualified, she gets the job.