Better to consider how society is divided in other countries.
Society in the UK is divided by class cultures, which have quite different sets of tastes, styles, priorities and general attitudes. While the connection between class and undeserved social privilege is unjust, it is not difficult to change your class. Save your money and send your kids to the right schools and they will pick up all the cultural and social baggage necessary to join the elite. Whether that is a good thing or not, is open to question. But the point is that education is the passport to social mobility. This is a fairly recent trend, in the past your future was much more tied to your birth.
Other countries divide themselves by race, religion, gender, age, wealth, political affiliation…Things that are very difficult to change. So you might be trapped by reason of birth, which is even more unfair.
In my part of London social life is riven with class prejudice. Those who consider themselves to be working class have little time for what they consider the absurd affectations of middle-class new comers.
Professionals, Public service heroes, corporate apparatchniks, honest tradesmen, sons of toil, three generations of immigrants, students and persistent underclass that could serve as extras for Breaking Bad or some David Lynch movie.
It is a heady mix and we are well practiced at ignoring each others existence.
Unlike the US, there is precious little space in the UK, we live on top of each other, rather than carve out territories by dividing cities into neighbourhoods of predominantly one sort.
In the US, you have to take care of where you go in a city. Your appearance marks you out. People shake their heads and tell you that it is dangerous. That does not happen so much in the UK. Though if you are improperly dressed for the occasion, you might have difficulty getting into a social event favoured by the gentry, like the Henley regatta.