I had the same thing happen once to me in my Science class. I got yelled at by my teacher for roughly the same reason you did, for critically thinking. But, I didn't go join the Peace Core, or have join up with some protest again science budget cuts.
No, I shrugged it off, and won top honors in all the science fairs at my school (the aforementioned teacher ran said fairs). And now I'm a bloody Astrophysics/Astronomy And Physics Dual major in his third year of college.
Just because you got pissed on by your teacher, and you think YOU'RE right, you have to accept that there is always someone who is smarter or better than you. If you think different, then your a bloody idiot. You don't have to prove it by joining up with some massive cause. You're young, you can shrug these things off and move on with life. You have a lot of year left, don't waste it on Politics or the Occupy Movement unless you are 100%, absolutely, without a doubt in your head, heart, or vital organs, certain that it is something you want to follow.
TL;DR: Frozen got pissed on by teacher: He got over it and didn't join a crazy movement.