I wouldn't disagree with you in broad strokes, but specifically? One party's white supremacists are trying to kill us; the other party has fewer white supremacists (if only because it's made up of more black folks than the other party) and has actually put policy into law that has helped Black Americans.
I don't think anyone would argue that the Dems don't have racists in the party or racism within the party at all. I'd hope not. But then again. LBJ was a virulent racist who got Eartha Kitt blackballed from working in the U.S. because she hurt Lady Bird Johnson's white feelings about how much farther Dems had to go to give equal rights to black folks, and he still passed the Civil Rights Act, Medicare/Medicaid, and SNAP, all of which have been extremely helpful to Black Americans. Not helpful enough, but extremely helpful at the same time.
Voting is nothing but a calculation that you can get at least some of what you want, when it comes down to it.