Everything in the video is 100% factual. There is no factual evidence that the parties flipped. It's a stupid hypothesis put forward by the left to excuse their shameful past and project it onto others rather than accepting responsibility for their own sins.
You're confusing 'left' with 'Democrats'. Liberals have never been for slavery, leave that to conservative mostly rural southerners.
Who nominated David Duke? Conservatives
Who is defending the shitheads in Charlottesville? Conservatives
Who revers the confederacy and defends the flag of the enemy and statutes dedicated to war criminals? Conservatives
Who has fought to end early voting that blacks took advantage of and purged POC from voting rolls? Conservatives
Who was defending Trump's original Muslim travel ban? Conservatives
Who has described Mexicans as rapists and murders? Conservatives
Who supports white nationalists...hell who are white nationalists? Conservatives
Who are the birthers? Conservatives
Who are the ones on this board who continue with racial language and claim blacks are dumb and Jews are greedy? Conservatives