I could see people being upset with Sam Smith. John Legend is a better artist in every way and that's an example of white privilege. Or Justin Timberlake. He is no better than Usher or Chris Brown.
With Adele, name one black R&B / soul artist who sings as well as her and has the material she has. And the personality to boot. Plus, she hasn't over exposed herself like other artists so people anticipated her return.
And c'mon. Adele is fat in an industry that only cares about image. She isn't selling only on her skin color like Katy Perry or Taylor Swift.