Cell phone video shows TNT Academy Principal Nancy Gordeuk saying:
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"You people are being so rude, to not listen to this speech. It was my fault that we missed it in the program. Look who's leaving...all the black people."
Gordeuk says she forgot to introduce the class valedictorian at Friday's graduation ceremony.
When she brought him up towards the end of the program, she became upset when some started to walk out.
Gordeuk's comment triggered a wider walkout at the event, and now there are calls for her resignation.
Georgia Education officials have not yet commented on the situation.