Being perfectly fluent in a language does not guarantee that you will be viewed as a local or recognized as a native speaker. I am of Asian ancestry, born and raised in the US, and have been used as control for linguistics studies for my absolutely neutral midwest accent. Despite this, I get comments occasionally about how good my English is, and how I hardly have an accent (mostly in the midwest). People's perceptions and assumptions can play as large a role as language proficiency when it comes to "othering" and acceptance.