The "West" is an overwhelmingly racist concept that produces bizarre things like the categorisation of countries in South America as not being western despite for example Uruguay or Argentina having a majority of people with predominantly European ancestors

This is not bizarre at all.

Uruguay and Argentina are exceptions. The average person in most South American countries save Uruguay, Argentina, and southern Brazil have close to 50% Euro admixture. In some countries like Peru, Bolivia, and others, it's lower than 25%. And in some of those countries they still speak Native American languages in significant parts.
This Euro admixture comes entirely from southern Europe. Italian Americans were discriminated well into the 1990s (possibly even now), while Irish Americans lost their stigma in the 1930s. Looks matter. And South Americans' European ancestry comes from an already visibly darker population (Spanish rather than Germans/Anglos)

Also: Europeans have predominantly Middle Eastern ancestors. They're literally 60% Middle Eastern by blood (on average--it's closer to 80% in Southern Europe). However, they got extra depigmented due to dark climates and mixture with northern aboriginals. Guess what? They look different, so they are able to do racism based on these physical differences. Hence, European and Middle Eastern are different blocs, despite the former being majority derived from the latter.

Guess who also looks different from Europeans? Every single Latino population, yes even the Argentinians. Despite them being derived from Europeans, they are not European. It is visually obvious that they are not European, even if they are majority European DNA. And so racism can be done to them. And so they cannot ever be considered part of the same bloc.

And yes, there are technically "white Argentinians", this is irrelevant. Only 30% of Argentinians (I'm spitballing here) look unnoticable from a US white person to me.