Ironic that you post a picture of Aliamanu Elementary. Probably one of the most white bread public schools on the island due to the large military family influence. 

That said, I honestly cannot recall ANY issues about ethnicity bullying while a kid in public school here. I suppose the *worst* thing that you could call racism were the "Portagee" jokes! Then again, when I was a kid, Hawaii was still pretty isolated and now with instant internet hits on what's "cool" and "trending" or not there's probably a LOT of learned discrimination/hatred.