Joy Resmovits, the education reporter for Huffington Post,  is usually a sharp and thoughtful reporter, but she had a bad day today.

Today she posted an article blaming “bad” teachers for the achievement gap between black and white students.

Along the way, she makes some factual errors. For example, she states that the achievement gap in ninth grade reading narrowed from 1994-2012, from 33 points to 13.

But that is wrong, for two reasons.

First, NAEP doesn’t test ninth grade. It tests fourth and eighth grades.

Second, the achievement gap for eighth grade shrank during that period from 30 points to 25 points.

She says the achievement gap persists because black students get less experienced teachers (Teach for America?) and have less success in raising test scores (tautology, anyone?).

Joy should know that the achievement gap exists before the first day of school in kindergarten.

It is nourished by large socioeconomic differences.

The achievement gap is an opportunity gap.

Black students are far likelier than white students to live in poverty, to miss school because of illness, to live in bad housing, to be homeless, to have less access to medical care, to live with tremendous economic insecurity.

Their families have fewer resources to invest in them.

The fact that there is an achievement gap is not prima facie evidence that those who teach black students are not good teachers.

Frankly, it is not like Joy to sound like Michelle Rhee, Joel Klein, and Arne Duncan.

Joy Resmovits owes an apology to the many thousands of urban teachers who are hard-working, dedicated to their students, and determined to educate them despite the insults hurled their way by politicians and the media.