I know a couple of Dutch people that moved to Portugal. Surprise, even after living there for 30 years they are still openly discriminated against. My guess would be that such discrimination is so much a part of human nature that (sadly) if you put two people from one group and one from another in a room you'll instantly set off a whole slew of innate responses resulting in the two siding against the one.
It's sad but that seems to be the state of affairs and I don't expect this to get any better in the next couple of centuries. Barring an alien invasion that gives us a reason to play 'us' against 'them' on a bigger stage I doubt humanity will be able to really overcome this particular hurdle. Which is sad because it is a large driver behind all the violence and misery in the world.
It's sad but that seems to be the state of affairs and I don't expect this to get any better in the next couple of centuries. Barring an alien invasion that gives us a reason to play 'us' against 'them' on a bigger stage I doubt humanity will be able to really overcome this particular hurdle. Which is sad because it is a large driver behind all the violence and misery in the world.