Don’t forget The Osmonds, Leave it to Beaver , The Brady Bunch , The Carpenters and bad dancing.
“White” culture is basically a reference to American popular culture up through the mid-60’s. Blacks were few and far between on radio and TV (“Amos and Andy” were played by white men) or were portrayed stereotypically (Rochester on the Jack Benny Show, Buckwheat on the Little Rascals). Same for other races (the inscrutable Charlie Chan or the fiendish Dr. Fu Manchu; Mexican banditos from The Treasure of the Sierra Madre; the desert sheikhs). Sidney Poitier was an exception because he sounded “white”. Diahann Carroll in Julia was acceptable because she also sounded “white”. Also, she was working in a “white” job as a nurse and was the widow of a pilot killed in Viet Nam (how more conservative and white-bread can you get!).
As desegregation moved into the nation’s forefront and front pages it began appearing in other forms. Early rock music that built off “Negro” rhythm and blues was “jungle music” that would drive children into a sordid world of unbridled lust and degradation. It became more tolerable with Elvis (but those hips!).
The “white” American culture people want to preserve is one that is free from controversy or aspects that could be considered threatening to their status quo. Rap music in commercials, Dora the Explorer, even Apu from The Simpson’s are an intrusion into white Middle America.
Of course, I’m so white that I’m damn near luminescent. All of this is my interpretation pulled out of my ass.