One of the biggest problems in the world right now, and certainly the reason for so much "politically correct" bullshit, is that people get offended by something that isn't meant to offend. Bungie do some stupid shit, that's for sure, but this isn't meant as an insult. It's a typo. It's an error. I'm sure you've made a few. So, instead of being insulted and offended, realize that it's an error and move on.
[spoiler]I understand, they may write that wrong, but they should change it. I'll wait...[/spoiler] They can easily change that letter, If they don't change it, then It's supporting my thinking...