Men have never changed, it was the female who changed, with the vote and legal and cultural dominance since the 60s,females and their politics have driven the changes in America.
Actually it was the pill. That led to women giving away one of the things men want most from women - what’s between their legs - for free or a cup at Starbucks.
The rest of the story is easily discernable from that simple fact.
Technology is the biggest disrupter of culture and society.
Today it’s the internet and smart phone.
Tomorrow it’ll be AI.
Human nature doesn't change. What happened is that women finally escaped what was essentially biological and cultural slavery. Hey, look over at fundamentalist Islam. They're still doing things the good old fashioned way. It's funny, we see how draconian it is when the women have a chador on, but when we look back and see her in a corset and hoop skirts, we think it was paradise.