I am not convinced that separating students by ability harms anybody's academic performance. I think it's a false premise that a parent who wants their kid in advanced classes (or advanced schools) is behaving "antisocially."
When there is too great a difference in ability in a single classroom, teachers struggle to serve everyone's needs. I don't believe anyone is well-served by this.
When there is too great a difference in ability in a single classroom, teachers struggle to serve everyone's needs. I don't believe anyone is well-served by this.