I think when you had to buy a record or CD people would consider themselves a “punk rock” person or whatever for any genre and they’d tend to buy and listen to/show their friends that music.
With streaming services, and easy access to wide variety there’s not much need for this kind of thing so tastes blend more on the consumption side. They then start to blend more on the creation side too.
One thing I’ve noticed is that music has gone from an activity (listen to this record I got) to entirely personal and mostly ambient.
Maybe that’s a factor of my age, but I think it’s mostly related to higher stimulus activities now available on the internet.