It is you that is being disingeuous. The republican party, whether you like it not has a good track record on civil rights. The democratic party track is not as good historically. Neither party has been free of racists and bigots, nor is either party angelic. This remains true today.
Lets try it by era. Lincoln (Republican) emancipated the slaves, grudgingly. I'm a great Lincoln fan but he did say, "if I could maintain the Union without freeing a single slave I would do so." I'm also a touch critical over the suspension of habeas corpus. On balance that's GOP good guy.
At the start of Reconstruction, nearly 90% of Blacks lived in the South. In many cities and towns throughout the South, Blacks were in the majority. 80% of the Republican voters in the South were Black men until they were effectively shut out of the process primarily by Democrats in the South. Negative 1 point for Democrats.
So let's be clear the GOP was not supporting black America. They were black America.
One of my great heroes Teddy R. (Republican) is at best a push and pretty much presided over the Republican desertion of civil rights . . . not totally his fault b/c the evil Democrats did it. He just didn't stop it.
Roosevelt believed that racial discrimination was morally wrong and that a fragmented society could not flourish indefinitely. During his first term he appointed a number of highly qualified blacks to office in the South at the instance of the black educator Booker T. Washington, and he tried to create a biracial Republican organization in the South led by patrician whites. He also denounced lynching and struck against peonage through the courts. But the results were counterproductive. Southern political leaders and editors reduced enlightened white Southerners to silence by inveighing against "Roosevelt Republicanism," while the virtual completion of disfranchisement of Southern blacks by state action destroyed all possibility of creating a viable biracial GOP in the South.
Further regression in racial matters marked Roosevelt's second term. He let several state organizations become "lily white," made no statement on the Atlanta race riot of 1906, and discharged a large group of black soldiers for "conspiring" to protect fellow blacks falsely charged with murder in Brownsville, Texas. Reduced to inertia by his perception that fundamentally "the North and the South act in just the same way toward the Negro," Roosevelt failed signally to give the civil rights movement the kind of moral and educational leadership that he gave other causes then unattainable.
The Jim Crow South was hegemony presided over by the evil Democrats . . . another negative 0.5 pt for continuity. Until Truman (Democrat) led the push for civil rights . . . 1 pt Dems.
Strom Thurmond ran in 1948 on his segregationist ticket lost but elected to the Senate in 1954 as a Republican . . . negative 1 pt GOP.
Republicans have legendary voter suppression tactics along with plain old race baiting as recently as the LA Senate race (not to mention 2000 FL initiative to
correct registration; the system washed discrepant registrants. If you showed up to vote in some districts but your registration was deleted they used a laptop to directly link up with Tallahassee and correct it. At other polls the people were told "too bad, so sorry" . . . can you guess what kind of disparity that created?) . . . negative 1 pt GOP.
I could go on but why bother. The GOP provided the first and best support for blacks in America. Subsequently, basic civil rights were systematically and often violently denied through the actions of both political parties. On balance since 1948 the Democratic Party has provided significantly greater support for equality of all men than the GOP. The GOP has typically (but not always) persued tactics of voter intimidation/misinformation b/c the overwelming majority of black voters are registered Democrats.
To his credit, GWB, maybe McCain, Frist, Santorum represent a modern GOP that rejects much of the old notions embodied by (Dixiecrats=Republican=racist), Bob Jones notwithstanding.