Final answer:
A person rejecting the dominant culture's values would be in the 'resistance and separation' stage of Phinney's ethnic identity formation model, focusing on their own ethnic group's identity.
Step-by-step explanation:
If a person rejects the values of the dominant culture, they would likely be in the 'resistance and separation' stage of Phinney's model of ethnic identity formation. This stage is characterized by a clear preference for one's own ethnic group over the dominant culture, often accompanied by a rejection of the values, norms, and even political or socio-economic systems of the dominant society. This stage is part of a larger process wherein individuals explore and ultimately define their personal identity in relation to their ethnicity and the broader culture.