It's not that no one is aware of it - especially in the UK and US, where everyone knows exactly what class they are, and who's above and below them.
But practical economic apartheid simply isn't considered a form of discrimination.
In fact the whole point of the anglo economies is the promotion of earning differentials and economic discrimination.
That's always been the main aim of neo-liberal economic rhetoric - it's not about sharing, innovation or mutual support, it's about imagined personal sovereignty gauged entirely by how much cash you have, and how wastefully you can throw it around.
This is quite a telling proof to the fact that there is no such thing as "unlimited" freedom (or even tending there). And I say this from a more philosophical viewpoint, rather than the politically "progressive" sharing (in France, social "solidarity"). Free at last! Free at last! Thank God Almighty, we are free at last! (Martin Luther King)