There are some advantages to same-sex education. Girls tend to excel more in math and science with it. Maybe there would be some advantage in reading for boys in classes tailored more to them but I don't know if this has been demonstrated. I tend to think literature and social studies/history benefits from having points of view discussed from both genders. It's tricky but maybe a pilot program would not be a bad idea to see if it provides any results schools would want to adopt, but I am very much against the idea that the government would consider adopting as standard one way or another.
Girls and boys are born with the exact same brain, and there is nothing in biological differences that affects one's predisposition to one discipline or another. Maybe there are differences in education or social incitations, but making separate classes would only accentuate the problem.
This is discrimination. This is like saying black people are better at sports and worse at intellectual works (that might be factually true, simply because 1. blacks are poorer and can study less ; 2. the society's stereotypes orient blacks toward less intellectual jobs. Anyways there's nothing natural in these differences). It offends my deepest values as a humanist and a universalist. It should offend the values of you all.
race and sex are not really comparable, since sex is a universal and biologically valid concept. whether or not there are inborn differences, the point is that by the time kids reach school, and especially middle and high school, there are different tendencies (not absolute), so the question is how you approach the different tendencies in learning styles. it's not as though boys or girls are worse intellectually, just trying to see if there are different styles which help them learn.