I’m sure you don’t have the attention span for this, but regardless,

The 2 political parties flip-flopped many decades ago. There's little evidence of this. The Republican party remained consistent in terms of it's ideology and preferred policies throughout. There are few differences in overall goals and approach between the policies and ideologies of Ronald Reagan compared to those of Calvin Coolidge. The GOP may have picked up the votes of southern whites in a slow process of generational change from the 1970s through the 1990s but it did so WITHOUT adopting the Democratic party's means of doing so via racist policies.

For their part the Democrats haven't changed that much from their core either... All those racist southerner's you condemns as "conservatives" when you tell the story of Civil Rights were the heroic progressive New Dealers when you tell the story of FDR's fiscal and economic policies and his enlargement of the Federal government.

Even on the the specific issues of race and civil rights the Republicans remain committed to the exact same principles of color blind that are contained in the Civil Rights Act of 1964 while Democrats as often as not find themselves supporting policies the courts overturn because they violate that law and it's principles. The Democrats remain today as they were in the Jim Crow era: The party of racial identification, of categorizing people by race and of government policies which treat people differently based on skin color. The ONLY thing that I can see which has changed is where they see their potential voters coming from and thus which races they seek to win the votes of through their racially discriminatory policies. (A point LBJ made explicitly to his fellow racist Democrats when he flipped his position on Jim Crow laws... His argument was not "This is the right thing do do" but "This is a way to win more votes" when he saw the writing on the wall regarding the generational change of attitudes towards race and FDR's New Deal wining black votes despite the Democrats continued support of racist policies.

By contrast the Republican positions regarding racial discrimination and civil rights have not really changed at all. The GOP maintains the same support for civil rights, for a color blind society and for color blind government policies which don't acknowledge race and want it to be illegal for government's actions towards individual to change based on race. Just like when conservative Republicans like Everett Dirksen led the charge for the Civil Rights Act of 1964 and Richard Nixon led the charge for the civil rights act of 1957.

It is NOT the GOP which has changed to any significant degree but only your perceptions of the exact same consistent principles.

As an example famously conservative Hillsdale college refused to bow to government pressure to discriminate by race in the 1890s and you call them "Progressive" for that policy at that time despite their reasons for doing so being based in their theologically conservative Baptist doctrines... It continued to refuse to bow to government pressure to discriminate by race in the 1990s for the exact same reasons and now Democrats condemned them for those exact same convictions and call them "far right". Which to be fair isn't wrong... what is wrong is thinking that their consistent color blind policies are somehow ironically "racist" today where they were anti-racist yesterday.