I really don't know where you're pulling that from. Jim Crow America wasn't a good time for black people. Women got lobotomy after showing the first signs of depression. Gay people were demonized at every occasion.
A return to this awful social hierarchy is MAGA and the right's ultimate goal, no matter how unrealistic. They're dismantling the Civil Rights act piece by piece, just last week they've been able to gerrymander the black vote away thanks to SCOTUS.
Like it or not, every social progress in this country has come from the left.
Many of these things were actively advocated for by the Progressive movement, back in the early 20th c. (Lobotomies came a few decades later, but were ultimately rooted in the exact same ideas about the primacy of 'science!' and trusted institutions over people's lived experience and the deep reality of enduring traditional values.) Studying that history in depth is an excellent way to disabuse oneself of the naïve notion that Progressives are inherently the good guys.