Trying Hard Not to Explode Over This One

Caroline revealed to us tonight that this math teacher, whom we heretofore liked, has yet another humiliating practice.  Each week the students are divided into work groups to do projects and even tests together.  What we did not know is that after a test, the group is told to vote the one student out of the group who they do not want to remain in the group.  In other words, the kids who draw down the group grade because they aren't getting the material are voted out.  What the hell??  Sorry for the language but how is this encouraging a positive classroom environment.?? This is humiliation!  This isn't Survivor, this is a classroom full of kids who are struggling to learn and like math!!  I immediately emailed the principal because I have had enough!!   Am I overreacting? I don't think so.  This is just wrong.