All primary schools students are briefed annually about bullying and there are many channels of redress. Our founding fathers will not publicize such news to avoid racial tensions. Obvious that politicians are also trying to stir shit over such minor incidents in school to win the hearts of minorities.
Next, are the parents of the bullies not locally-born? Eg. new citizens from Malaysia or China?
For many years, I don't hear such uncivilized things in our society. Kids of different races get along much very at young ages compared to our times, because such low-class negative stigmatism are long-gone in our local culture.
As such, a malaysian-born chinese or China-born, parent is more likely to tell their children that Malays are like "black dustin".