Achievement vs. Appearance

Economist Arnold Kling Writes:

"In the 1990's, when my daughter was in middle school, her principal created a remedial math class for a handful of students. All of them turned out to be African-American. The local chapter of the NAACP took offense, and the principal was dismissed."

Let's assume that the kids in the remedial math class received more resources and a better education than they would have received outside of the class. Was the NAACP right to object?