Apparently, the teacher also "invited" female students to hear a head-scarf, as is the norm for Muslim women. That request -- in addition to the statement that she chose for them to write (as calligraphy practice) -- led to the backlash :
School shut down over protest on lesson on Islam
Student forced to try a head scarf
Laurel Truxell, a student in the class, told an NBC affiliate in Charlottesville, Virginia, that she at first refused to try on the head scarf, but “the teacher pushed and pushed and pushed so I did it,” she said. Her parents called the school to object after Laurel was told a picture of her wearing the head scarf would be submitted to the yearbook, she said.
_________________
O villain, villain, smiling, damnèd villain!
My tables—meet it is I set it down
That one may smile, and smile, and be a villain.
At least I'm sure it may be so in "Denmark".
-- Hamlet, 1.5.113-116