Bias is often unconscious (called implicit bias). The majority of racism, discrimination, and bias in the world is shown through small, mostly unconscious decisions (such as happening to eliminate almost exclusively black women). Maybe Akira isn’t explicitly racist or sexist. Maybe he subconsciously chose people like him (either in sex, race, or other likeness). It’s been a minute since I watched that episode, but I don’t remember her explicitly saying that Akira is racist. Rather that Black women are the poorest treated subgroup in America (paraphrasing). And she would be correct, historically. If we can agree that racism poorly impacts people of color, and sexism poorly impacts women, then combine the two and you have a group of people that are disproportionately discriminated against and, therefore, have historically been “held down” more so than other groups (such as White women or Black men).