system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Classes, classism, and social mobility in the UK as opposed to the USA

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gpt
In the UK we have the generally accepted classes of working, middle and upper. The place you are put has very little to do with the money you earn and more to do with who you are and who your parents are.

For example, most high earning footballers would be considered 'working class' by themselves and others, it is a badge of honour for an actor to speak about their 'working class roots' despite earning millions of pounds. Working class is salt of the earth poor but honest kind of thing, but comprises everything from the unemployed to the plumbers that can earn a hundred or so an hour, so you can have very well off working class, they have big TVs and comfy sofas.

Upper class can be seen as royalty, aristocracy, and people along those lines, they send their children to Eton and Harrow and have large homes that have been passed through family, but don't always have a large amount of money, there are a lot of stately homes in this country that are open to the public as the residents can't afford to run the homes on their own income any more. They furnish their houses with antique furniture and heirlooms which often don't match but are probably worth more than your organs.

Middle class is more complex, they are often categorised as 'strivers', basically people who in the past were working class but seek to be upper class, this category is often massively divided up as it is fairly diverse, and can include anything from a manager of a bank branch to a doctor or above. These are the people who can become massively obsessed with cutlery order or the minutiae of etiquette. The working class don't care because it doesn't matter, the upper class know it, but don't really care if anyone else does. They buy their furniture new from designer stores and their homes look like show homes.

The US system is almost entirely money based and is very different

If you're interested in learning more I'd recommend "Watching the English" by Kate Fox, it is a wonderful break down of british culture and sums up the class system really well.