It is not only culture, we want to see peoples faces for a reason. It really helps with communicating and if it is disturbing a class in anyway i think it is more then reasonable to not allow it.
And why should you not make anything illegal for cultural reasons? I did not know this was a rule, i think it is very reasonable to limit some things that clash with our culture. Like keeping your parents after they have died is a cultural thing in some places, but i would not like to see that happening here.
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It was about a niqab, not a nijab. And you where addressing me, not OP, that was not what i was on about.