For my part, I think the culture has descended dramatically in my lifetime (born 1960) and I think a good part of that is because negro culture has been adopted by whites as a superior culture -- which it isn't.
I was born in '62, and I don't remember a completely clean pop culture. I was 8 in 1970, when I started to become aware of the world beyond my town, and a lot of what I saw in pop culture was strange and scary. I remember the "ink blot" rock groups, constant news reports about hippies, riots and LSD, graphic images of the wounded in Vietnam, etc. On the plus side, there was the excitement about the moon landing, and heartwarming TV shows like "The Andy Griffith Show" and harmless pablum like "The Brady Bunch."
To my mind, the big cultural shift happened from 1967-73. It was the era of Acid Rock, "drug rock" (Pink Floyd) and the birth of Heavy Metal (Black Sabbath/Led Zeppelin). It was the drug age (LSD, mushrooms, heroin), and the era of free love. Psychology took the place of religion, to a significant degree. It was the era of "demonstrations" against all institutions. And Vietnam was a hopeless quagmire.
Looking back is sad. I remember the "old school" people and institutions fading away, but I don't remember the same institutions in their glory.
For some reason, those years, 1967-1973, are sadder to me than the current state of our culture, which seems to be in free fall.