Moving on to your next claim that all of these Democrats who resided over the governance of Alabama and Mississippi were "conservatives" (a subjective term in its own right), I guess I will just let you believe that. They all ran against and beat Republican challengers, and something set them apart from their opponent. I would argue it is that their opponent was more conservative than they were. To go all third grader and suggest that the South hasn't gotten more CONSERVATIVE over the last 30 years as opposed to just more Republican is below this site.
Alabama and Mississippi (among other Southern states) were one-party states until the early 80s, when Reagan's fanning of racial tensions dragged the states into competitiveness. The real election was the Democratic primary, where conservatives generally beat out moderates and liberals. Before Reagan, Republican candidates were not "challengers", they were just paper candidates who were not in any way politically relevant. So what you are saying only starts resembling what actually happened after at least 1980, and really only truly becomes the rule after around 1990.
In any case, why are you upset that all racists became Republicans in 1964? From that base of racists, the GOP managed to grow the tent to eventually even include "totally not racist but only have white friends" people like you.
Surely, if nothing else, you’re shifting the timeline, there were a few competitive races that were unprecedented from about 1962 to 1966. Jim Martin, Bo Calloway, etc.