There were black people in the 1950s that were resistant to segregation. They don't teach you that in high school But there were. See if you take piles and piles of real history classes with Un woke professors (yet still liberal) in the South you learn these things.

There were many reasons. Some were well off black people who had established businesses that catered to black only crowds and could see that all end. They also, themselves had their own thing and didn't really want to mix with with low class black people nor with white people when they didn't have to. There were two separate worlds for these people and they LIKED it. These people had a damn good thing. Millionaires. These people's families still run all kinds of shit. They were in college when my poor great grand mother was in a field picking squash.

Then there were poor black uneducated people that just didn't see the point and saw it as risky and dangerous. They liked the status quo and didn't want to rock the boat, they had jobs and connections with white people that would be damaged should all this bullshit be upturned.