Yeah, I mean come on ... if an Afro is capable of blocking the chalk board, so are a lot of styles that have nothing to do with an Afro, as AdT just pointed out. Plus, this ignores the obvious fact that plenty of Afros are short and, like any short style, won't block much of anything
. How silly.
I'm one of many people who has "big hair" without any kind of Afro. Even straightened (as straight as I can get it anyway) it appears big. So I could see where "big hair" in general
could be distracting. But it's some kind of crap for a school to single out one group of peoples' hair styles if the main issue is just "blocking the chalk board"