It’s not a real thang. The difference between, say, Norway and America is as big as the difference between Murica and China.
In some ways China and Norway are closer to each other than America.
In other ways, America is closer to China than Norway.
There is no western culture. It is a fucking sham.
Just look at Hollywood. The Chinese working class and the working class in the global south love it. Meanwhile Hollywood is dead in Europe because they can’t Relate to it anymore. That should tell you something.
Culture is infinitely more complex and layered than the stupid East west shit. Fuck.
East/West isn't an entirely useless concept. If nothing else, the very fact that people use and talk about it means that it has meaning; after all, there's no real distinction between something real and something that's a social construct when talking about culture.
That said, there are a lot of people that are really unhealthily obsessed with the concept and take it to ridiculous extremes.
edit: and also to agree with another commenter, a lot of people use it in place of terms that would be more accurate.