HELP MORTIFICATION? 10 Points?

Me and this guy had a project to together and to be frank I did most of the work since he went away for a week on a trip. I did it diligently and without complaint; it's the end of the year and summer is right around the corner so at least then I have less homework (just physics, English, and algebra/geometry) for the summer. So we presented our project today and according to our peers, the presentation was great. I had worked really hard on the Powerpoint and the life-size silhouette we had to do so I felt a little better about it. But then, MY PARTNER POSTED THE GRADE ON FACEBOOK!! I use Facebook primarily to get in touch with people quickly, but not really to post what's going on in my life and I just could not believe it. WHO DOES THAT? The silhouette grade was embarrassing really, a mere low 90s and the PowerPoint was okay, but it could have been 100. And I told him: THE SILHOUETTE WASN'T EVEN THAT GREAT and even if it were, you're supposed to accept it humbly and modestly.That's what I typed verbatim. And he replied, "lol". AH!