I grew up the first ten years of my life seeing a de jure system of racial elevation of white people and disenfranchisement of black people. As a seventh grader I had a teacher who was in the reserves give me a half hour lecture of how Japanese and Vietnamese were sub human and had no value of life. I grew up watching world war II TV shows like Combat, or movies like the longest day where a White European nation killed people who were Jews, gypsies, and non white. I saw the KKK on TV who actively attacked people who believed in equality and equal protection for all citizens.
In this slant growing up white, I had the opinion instilled deeply into my perception of the world as a child that blacks and hispanics were less capable, and that White People were special and privileged. I went to high school with black and mexican students. I had a few friends who were incredibly talented and intelligent. They were black. One is now an actor who has struggled in his career, but at 64 is getting great roles and is quite successful now.
Yes, being white in the 1950s created a presumption which had to be actively countered by a person growing up in that era.