Time travel. It was true ~100 years ago. Very much so in a very extreme way.
One example comes to mind since I recently watched a short video on Theodore Roosevelt. In 1901, he invited Booker T. Washington to dinner. A social thing, come to my house and have a meal and a chat. But Theodore Roosevelt was the president and his house was also the seat of government, so it was also a political thing despite Roosevelt apparently not intending it to be. It was major national news by the morning, sent by telegraph all over the USA during the night and front page news on the early editions of numerous newspapers.
Democratic senator Benjamin Tillman's response to the news was to state, publically:
"The action of President Roosevelt in entertaining that [Magic Bad Word forbidden here] will necessitate our killing a thousand [Magic Bad Word forbidden here] in the South before they will learn their place again."
He was far from the only Democrat with those views. Bear in mind that he wasn't just a Democrat, he was a senior politician in that party, a senator. Who was re-elected afterwards.
Republican president Roosevelt stated "The only wise and honorable and Christian thing to do is to treat each black man and each white man strictly on his merits as a man, giving him no more and no less than he shows himself worthy to have." Pretty radical for the USA in 1901. Pretty radical again today, sadly.
So it was true in the past, but mmj_uk is making, to put it politely, an unsupported connection when they claim it's true today. Despite mmj_uk's claim, political parties don't have DNA. They're not living things.