You're right about the Dixie Democrats, that they WERE the party of segregation. But that's past tense.  Southern Dems WERE segregationists until 1964, when the Party, led by northern liberals like the Kennedys, Hubert Humphrey and Gene McCarthy became the party of civil rights.

The rest of your post seems so miraculously misinformed, that I must not be understanding you clearly or something. Nixon's Southern Strategy took the South from the Dems, just as LBJ predicted, and the GOP still hold it, largely by playing poor whites against people of color, just as the Jim Crow Democrats did after Reconstruction. 

You might be fudging certain key distinctions: "segregationist voters" means nothing after 1968 or so. Southern white voters remain largely anti-civil rights, just as they were during the Crow; it's just that now they vote GOP, like religiously. There's no "if" about Nixon's "Southern strategy", and it has worked beautifully to turn disaffected white voters GOP.