So if (for example) a worldview is Western, what does this say about that person?
The world is to complex for us to treat every experience, person or event as entirely novel or unique.
As such we need to generalise and stereotype, to some extent, to put things into broader categories that are useful.
The key is to find the right balance between generalising/stereotyping and seeing the differences and nuances in every experience, person or event.
A modern Western worldview would be scientific, individualistic, humanistic and liberal-democratic. Obviously this is a massive generalisation that doesn't apply to many and would usually be used as a starting point of comparison with a different worldview.
The utility of any such generalisation would depend on the context it was used in. But it would be silly to think we can't make some generalisation of difference between the worldviews of lets say Salafi-jihadis and the average Western person.
Everyone's worldview is unique, but we can generalise to some extent but the greater the generalisation, the lower the accuracy.