For a group of people who wear "facts over emotion" like a badge of honor, y'all don't pay much attention to facts and tend to get super emotional when you're confronted with them.
Fact: No Democrats deny that, until the mid-20th century, their party was largely the party of white supremacist groups, the Confederacy, Jim Crow, and segregation. It's a terrible part of our past, and we are in no way proud of it.
Fact: Southern Democrats, in particular, were the drivers of this despicable aspect of the Democratic Party's history.
Fact: Southern Democrats who opposed the Civil Rights Act, Strom Thurmond chief among them, defected to the Republican Party beginning in the 1960s in the name of "states' rights."
Fact: The Republican Party has a platform that is attractive to white supremacist groups in pursuit of their goals. Support of states' rights over Federal control has many benefits, most of which are not racist in any way; however, if you ARE a racist, you know that you've got a better chance of reinstating Jim Crow on the state level in Alabama than you do on the Federal level. Strict immigration policy isn't inherently racist, but is incredibly attractive to someone who dislikes people who are brown crossing the southern border.
Fact: The Democratic Party, conversely, has a platform that is massively unattractive to white supremacist groups.
Republican does not equal white supremacist. On the other hand, white supremacist currently equals Republican. And the Confederacy was racist AF, at its very core - why would anyone want to glorify it?