I agree that the Facebook posting of their grade wasn't something I would do, but as far as I'm concerned if they did as well as they said in their post, they have every right to brag. Besides, I doubt they were really intending it for classmates. I know I use Facebook a ton to keep in touch with people back home. As for studying, even if you don't have to study much, if you aced the exam, you knew that material and followed through with it, so good for them. I mean yeah, I did great on one exam and not so great on another, so everyone is gonna have ups and downs. I was super proud when I got a good grade, did I go around bragging at school? No, but I was excited and posted here that maybe everything was gonna be okay, and vet school wasn't impossible. However I am way too exhausted both mentally and physically to even really listen other people talk about grades right now, so that also keeps me from caring.
What bothers me more is when you're trying to learn something in a group environment, such as labs, and one person somehow already knows it all super well from either previous courses or studying before class and then makes it crazy hard for you to learn the material because they keep shouting out the answers whenever you're trying to go over something and learn it yourself.