I'm going to be very blunt about the purpose of this letter: it is to tell you that I don't like you. I will preface this by saying that I am not an idiot. Of course I remember that last summer you were an intern here and that you actually sat in the cubicle on the other side of me. I remember every time you came in with a jolly "GOOD MORNING!" in your non-descript, Eastern or Central European accent. I remember you asking me what I do and the blank expression that you tried ever-so-hard to conceal when you didn't understand a word of what I was saying. And, most fundamentally, I remember your collection of cheap, CVS colognes, a different one each day which confounded my olfactory sense's ability to "tune out" such acrid funks.
Now, you have returned and I suppose your MO is not to acknowledge people. You still bathe in a different stench each day and still try to hard to impress your peers and manager. Yet, even though I have said "Hello" to you several times and even gave you a "Welcome back" when you first returned, I have never gotten reciprocation. Maybe your group's sense of superiority has so blinded you that you think you don't have to acknowledge anyone else in this office. Maybe you're just trying to prove your mettle and think you need to be no-nonsense. Or maybe in your senior year you just became a dick. I have no idea.
Bottom line is, boychik, one of the keys to success in the real world is not to burn bridges, no matter how meaningless each connection seems to be. They obviously didn't teach you this at Fairfield.