People that observe that “race” is a highly malleable concept (there isn't even a broad agreement on how many races there are) that evolves with social, demographic, and economic shifts in the culture whose views of race are examined.
No, people who recognize that despite the conceit that race is a “biological concept”, the identification of race (both ascription to others and self-identified) has always been driven by the same sociological phenomon that drive ethnic identity, and that, in practice, the concept of race operates as simply a broader set of ethnic categories, which is why identification of what races exist and how people are identified as being in one race or another vary not only between cultures, but within the same cultures over time.
Race and ethnicity are simply larger and smaller group categorizations of humans, both with reasonably accurate biological tests.