Un-freaking-believable. That letter writer is a college grad? What the heck are they teaching in colleges now? Certainly not work ethic or common sense.
1. Law firms are filled with lawyers. Ergo, don't expect it to be a warm and fuzzy environment.
2. Leaving off the "NW" in an address is not a "simple mistake," as anyone who's spent any time in DC knows.
3. If the letter writer hopes to go to law school, he/she better quit whining because he/she will have to learn even more nit-picky things (e.g., "L.L.C." and "LLC" are not interchangeable).
Please tell me that not all 20-somethings are like this.