Many of the culture changes you cite were in their early stages at the turn of the century...while today's search engines are much more powerful, they did exist then as did cellphones. I definitely remember people driving, walking, etc. talking (often loudly) on their flip phones back then. Likewise, it was pretty obvious looking at the music charts that hip-hop was what was happening, and rock was fading. Granted, all of these trends have accelerated this century.
Agree 100% that each generation has their own culture, often baffling to their elders. Not sure how old you are, but I know my generation's (boomer-born early 1950s) culture was quite alien to my parents, probably would have been more so to my grandparents if any had still been alive when I was a teen. Always been that way, probably always will.
We boomers swore we'd never turn into our parents, yet here we are.