The media trick is to state the proportional distribution of punishment, and not the proportional distribution of offenses.
They make it sound unjust, which is what they intend to do.
I was trying to find anywhere in the article where it listed the proportion of offenses committed by black students vs white students. Or something like: "When a white student started a fight, he was suspended 50% of the time, when a black student started a fight, he was suspended 100% of the time." This just says black students are punished more, but doesn't explain the reasons behind punishment.