First of all, thank you for everything you do as a COVID worker.
Secondly, I think your findings are in line with the data in this article. Blacks and Hispanics are acknowledged to have a lower vaccination rate than whites. DC being as liberal as it is, it makes sense for most of the unvaccinated in your community to be Black or Hispanic. The article also notes that, historically, liberals do tend to be anti-vaxxers because of distrust for Big Pharma.
Again, keep up the good fight on the COVID front lines. You're doing God's work.