Could be something as simple as dust or mold allergies, schools tend to have a lot of both.

I do feel there are some legitimate things that make people feel bad that have been around forever unquestioned though, like fluorescent lighting or the white noise of electricity buzzing. I've got both in my office at work, and it seems to just drain me within a couple of hours of sitting in it. I'd say fluorescent lights humming in classrooms is a bigger concern than wifi. If nothing else, it drives you crazy having to listen to it.