"pronounce the word".   I thought about this too.   But look, people, she is a Spanish teacher.    It seems a good bet she knows that in Spanish the word is pronounced "nay-gro" and that's the way she would have done it. So that argument fails also.

What seems likely to me is that she is a disciplinarian and at least one student realized the way to remove the disciplinarian was to attack her on the PC basis.    This, as I've noted, is a classic abuse of PC.

But of course there were "four seventh-grade witnesses"--what more could anybody want?
Everybody knows 7th-graders would never exploit a situation.   Of course not.