There's always been us and them.

Boris  Johnson - Mayor of London - has fallen into the trap of stating a self-evident truth, but doing so in a (maybe deliberately) insensitive and provocative way.  The subject is intelligence - or more precisely IQ.  He made the obvious point that for the most part, those with a low IQ will struggle to get on, and that inequality is and always has been a fact of life, and envy and greed are (admittedly unpleasant) drivers of the economy.  Could perhaps have put it better, Boris, but the logic is inescapable.