> Would you really not consider e.g. adoptive children to be part of the culture of their adoptive parents?

Sure. But culture isn't "innate". But being a westerner is innate. I could learn chinese, but that doesn't make me a chinese person. A chinese person could learn english but he is still "innately" chinese.

> Very easily, since one is an ethnicity, while the other is a nationality/culture.

I already acknowledged that. My point is what do you mean by a western person or a westerner. Anyone can partake in a culture. You can eat chinese food or indian food but that doesn't make you a chinese person or an indian person.

Am I wrong here. Or is the term "west/westerner" used differently around the world.