The federal judge in Detroit who ordered last week that female children be admitted to an experimental school for boys seems to be operating on the theory that any discrimination is wrong and therefore illegal. That's fallacious law, and fallacious thinking as well.
The law does not prohibit all discrimination, only irrational discrimination. And there is rational basis in abundance for the Detroit school authorities to conclude that single-sex schools, staffed primarily by male teachers, could substantially improve the educational performance of inner-city children who see few males in their lives who are worthy of emulation.
Far from showing that girls are disadvantaged by single-sex classes, there is solid evidence that female children do better when they attend all-girl classes. This being so, it's hard to see how the female children would be hurt by being excluded from the all-boy classes -- assuming, of course, that they are not being deprived of better funding and equipment for the benefit of the boys.