Whatever happened to urban tribes?

I remember reading and hearing about the different tribes, music and trends in the 90's and 00's. But apparently nothing now.

Have we become more homogeneous as a society?

Is it not politically correct to spot patterns and sort into categories now?

Have we become so diverse and tolerant that we no longer even notice that people fall into different “tribes”?

Has politics superseded music and hobbies as the most conspicuous markers of tribe affiliation?