that there's some research out there that supports segregating genders; I'm skeptical and have not yet checked it out for myself. IIR, it has something to do with girls feeling academically safer without boys, especially in math. 
Hence my skepticism. I might not be remembering correctly, though. If it were likely to happen in my district or region or state, it would probably be higher on my priority list. As a middle school teacher
Regardless of what that research might say, ANY type of structure, format, philosophy, or methodology can be used well or misused or abused.
Based on your link, it sounds like this particular school is abusing the concept, as well as displaying blatant ignorance and/or bigotry concerning gender expectations. I think the ACLU has a good case.
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