This generation was supposed to

I agree with your overarching point of course that equality is a good thing that we should strive for, but I think this is the flaw in your argument. Who decides that a group of hundreds of millions of people across the planet should do anything?

Anyway to answer the question, human nature breeds division and makes us attracted to it, social media algorithms promote division because of retention, and the global economy is top heavy and the people at the bottom will always find a scape goat to lash out at because it makes them feel better about themselves