“And then I said, ‘Did you know that every member of the Ku Klux Klan were Democrats from the South?’ ‘Oh I didn’t know that.’ You know, they need to be educated.”
So does he. The KKK wasn't just in the South and when it did leave the confines of the solidly Democratic South in the 1920s, it was just as warmly welcomed by Republicans as Democrats. Indeed, it in the North, it likely was more Republican than Democrats, especially amongst people whose grandparents had been nativist Know-Nothings.
Sounds like the Civil Rights vote. Once you correct for Northern'/Southern, Democrats in both places were more likely than Republicans to vote for it.