You can't exactly double-blind study black people but how many studies do you really need? My original stance was only "in some cases, discrimination exists". You're really ridiculous about the bar of evidence you expect from me here.
"Are Emily and Greg More Employable Than Lakisha and Jamal? A Field Experiment on Labor Market Discrimination" https://cos.gatech.edu/facultyres/Diversity_Studies/Bertrand...
"Systemic Discrimination Among Large U.S. Employers" https://academic.oup.com/qje/article/137/4/1963/660593