Here is a description of Dixiecrats

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President Franklin Roosevelt's electoral body in 1945 had included a diverse, in fact contradictory, set of elements — both conservatives and liberals, northern and southern Democrats and Republicans. By 1948, however, the civil rights issue revealed the real philosophical differences between northern and southern Democrats as never before. The move of Southern states from solidly Democrat to solidly Republican began to take place. In that environment, the Dixiecrats and the “Southern Strategy" was born.

At the 1948 Democratic National Convention, a group led by Senator Hubert Humphrey of Minnesota proposed some controversial new civil rights planks of racial integration and the reversal of Jim Crow laws to be included in the party platform. Southern Democrats were dismayed. President Harry S. Truman was caught in the middle for his recent executive order to racially integrate the armed forces. As a compromise, he proposed the adoption of only those planks that had been in the 1944platform. That was not enough for the liberals. Truman's own civil rights initiatives had made the civil rights debate unavoidable. 

The planks were adopted and 35 southern Democrats walked out in protest. They formed the States' Rights Democratic Party, which became popularly known as the Dixiecrats. Their campaign slogan was “Segregation Forever!" Their platform also included “states’ rights" to freedom from governmental interference in an individual's or organization's prerogative to do business with whomever they wanted. 

New York moderate Nelson Rockefeller's defeat in the presidential primary election marked the beginning of the end of moderates and liberals in the Republican Party. 

Clearer political and ideological lines began to be drawn between the Democrat and Republican parties as moderates and liberals converted from Republican to Democrat. Conservatives in the Democratic Party began to move to the increasingly conservative Republican Party

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https://www.u-s-history.com/pages/h1751.html

From the 538 article

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Although media attention has largely focused on Trump voters, a working paper showed that it was actually Clinton voters who underwent the more dramatic partisan shift in 2016 (echoing other findings). The largest changes in views of race and gender occurred among white liberals; their perceptions of racial and gender discrimination increased, their feelings toward minorities improved, and their support of policies aimed at increasing diversity, like affirmative action and allowing more immigration, rose. Voters who consistently voted Democratic moved to the left on these questions, especially young voters. That means studies that show an increased association between Trump support and conservative views on race and gender might in part actually reflect Democrats becoming more liberal on these questions.

Thus, the darkest portrayals of Trump riding a growing wave of racism and sexism to victory may be somewhat overstated. Research on the 2016 election does not support the idea that Trump benefited from an overall increase in racist and sexist attitudes among white voters; rather, the evidence shows that liberal-leaning voters moved away from his views faster than conservatives moved toward them.

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Perhaps we are simply witnessing Dixiecrats 2.0