Are you talking about all girls and all boys schools? Not clear on what you're suggesting. I've never heard anyone say they are immoral or result in inequality. They are simply done to prevent distraction. As a parent I could see value in having a girl go to an all girl school, and probably less value in a boy going to an all boy school, although in both cases the schools are going to be private schools that are better across the board, and in nearly all cases would be religious based schools, so you would have to be less worried about degeneracy and anti white hatred being taught in them or simply being part of the daily culture they are subjected to.