Racism is a HUGE issue in my high school.
A rough estimate of how diverse it is: 60% white, 30% Indian, 5% Asian, 3% Central and South American, 2% Native and Black.
In our school of 2,000 students we have exactly two black people, and two half-black people. They are all pretty much normal, and I have never heard any of this ''white trash'' stuff coming out of their mouths. It's not like black communities in the USA trash-talk white people for no reason. Where do you think the discrimination came from in the first place?
The real racism issue in my school is between Indo-Canadians (brown people as everyone calls them) and white people. For over six years we have had two gangs in our school that like to call themselves ''The Cowboys'' and ''The Indians''. The Cowboys are generally white people who spit tobacco, loiter at our town's famous annual rodeo every May, and wear cowboy boots. The Indians are brown people who hang out together. There were several gang fights a few years ago, and two years ago, in my first year at high school, there was a CODE RED at lunch when a fight broke out, and the whole school (teachers included) had to hide under tables in the classroom nearest to us. The Cowboys go looking for a fight by making racial slurs, and usually The Indians take the bait by defending their culture in a physical manner.
On the surface it might not seem like it's there, but a lot of white people in my town are racists. I'm not one of them.