From the AP article.

The assignment was for a psychology class about lifespan development. Students were asked to write a 650-word response to an academic study that examined whether conformity with gender norms was associated with popularity or bullying among middle school students.

“Please note that I am not deducting points because you have certain beliefs,” the instructor wrote in feedback obtained by The Oklahoman. Instead, the instructor said the paper did “not answer the questions for the assignment.”

The paper “contradicts itself, heavily uses personal ideology over empirical evidence in a scientific class, and is at times offensive” the criticism went on.

The article links to the essay, but not to the referenced paper. Does anyone have a link to the original paper?

Edit: The Wikipedia article has sa link to the academic paper. In the Wikipedia page, it's claimed that another instructor reviewed the grade and agreed with the zero. I don't have the rubric, so I can't judge for myself, but I wonder other than not turning in the paper or mentioning that there was a paper to read, what would earn you a zero? Her paper was a rant.