That's a good point. My school is often criticized as being a white upper class school, mainly because of it's location in my city. I thought about trying to mention this in my article, and in hindsight should have.
I'm as much a grammar-and-spelling nazi as anyone and can quote you chapter and verse the difference between it's and its, your and you're, effect and affect - but considering I've misused every one of these within the last week in email and sundry comments scattered across the interwebs, I'd argue this is not much more than "sometimes we all type fast and fuck up" ;)