Hiding excellence is called modesty. It is usually slightly frowned upon behind his back when a student broadcasts his exam scores amongst his peers. When I made it into podiatry school, I expected and received congratulations from my friends and family. When I pass my board examinations, I do not expect nor should I receive congratulations from anybody. Boards are something that students are expected to pass in order to receive their medical license.
I entirely agree with most of what you're saying. Walking around hearing students talk about exams for the last semester and a half, I've only heard mention of an actual score a single time; the rest of the time it's something to the effect of, "it was harder than I though", or "I did okay". It's something of a faux pas to speak directly regarding your scores, and I consider it in poor taste.
I suppose I just don't see the harm in celebrating a passing grade on the boards. At least, not when you say you consider it okay and reasonable to celebrate admittance.
My thought is, who cares if you got in? I mean...it's cool, you'll learn at least something, and you'll spend a couple hundred thousand doing it, but the boards are the only thing that
really matter when you get down to it.
Let's be honest...you don't really have to do much to get into pod school. You have to do very much to pass the boards. Celebrate that, not admittance. What's more worthy of celebration: a GPA above 3.0 (remember, this is undergrad...) and a 20+ MCAT, or passing 4 years of pod school and the boards?
I get ya' regarding professionalism, and maybe I wouldn't have done specifically what the OP did, but there's a time and place for celebrations, and I think the pod student forum for passing the pod boards on an internet message board is as appropriate as anywhere else.