I live in a place a lot like you describe, and I think socio-economics of a location is a great indicator of racial relations. In descending order, my school is populated with Asian (so many different flavors), Hispanic (again, many distinct locations of origin), Pacific Islander, Hispanic, Europeans, a few Middle Eastern, black, and white. I have one family that fled the revolution in Egypt. A beautiful rainbow of humanity. I'm in the Bay Area of California. They live together, but hold very serious stereotypical views of one another based on ethnic heritage.
I showed the movie "Freedom Writers" in the first week because seventh grade seems to be a great time to break them away from the racist bullshit they've incorporated from their parents and show them that more than we're different, we're the same.
I'm not trying to be an ass. I guess I was just stricken by your statement that race and ethnicity don't really show up in life...with the implication that if we aren't racist, we never need to mention race (yes, I readily acknowledge that you didn't say that). I'm being a bit earnest and hoping you and everyone will see that some of us must address our differences in appearance, background, culture, color, race, and religion.
No matter your actual sentiment in your welcome, I am truly happy to see you.