The Paterson teacher posted her remark to 333 friends on March 28. But it was forwarded and led critics to call her comment racist.
O'Brien's lawyer, Nancy Oxfeld, said that O'Brien will appeal the ruling, which was made public Tuesday. O'Brien had testified that she wrote the post in exasperation because several students kept disrupting her lessons and one boy had recently hit her.
But the judge called O'Brien's conduct "inexcusable."