I think you meant employer, and I agree. No one should accept this; if they do, they’re guilty of condoning racism.
You want to eliminate racism at work, then fire those that actually do racist things while on the job.
Like releasing this manual on how to be a racist. Fire JJ Abrams.
Anyone who requests a day off, should be able to do so with no questions asked, regardless of skin color.
IMO there’s no “should” here. There are times a day off isn’t feasible. But whatever the policy about days off might be, skin color should have no relevance — that used to go without saying, never imagined it wouldn’t.