Please get rid of the argument "This isn't a kindergarten class". From our perspective, the fact that you are NOT a 5 year old should mean that you know how to treat people.
And yet here you are, however old you are, flaming an anivia for picking a champion YOU don't agree with, flaming Janna for making a decision you didn't like, then Zed for building an item you don't like.
I don't know why this was escalated to a 2 week ban, but It is fairly obvious why it was punished. Stop acting like a kindergarten child and then complaining when the adults you do it to take advantage of the measures put in place to that effect, to make you stop.