Yes, I get your point... Tell me more about your father. Does he have a girlfriend. What does she think of 'Pink Flamingo's'?
Probably the most banned ever artistic movie. Shocking, disturbing, but thought provoking. Four fascist libertines round up 9 teenages boys and girls and subject them to 120 days of physical, mental and sexual torture.
Well Dad is a child of the 1960's, and actually hung out in Iowa City with friends both gay and straight through the mid 1970's. Dad recently remarried last year to his second wife. I doubt she ever saw Pink Flamingos. She will not watch anything that has a rating over PG-13.
Try: The Day the Earth Stood Still, a black and white movie from 1951. Early television had some serious content. And then it turned to shit, so it goes.