Why did I get banned from MP?

Okay, I go play MP. I go to play the online play, I say hello, and everyone says that I sucks and everything else. I didn't do anything wrong there. Then I ask why everyone is mad at me and they say that they are going to get summerschool to ban me because I was spamming. All I said was hello. Okay, so I saw "Sure. Yeah. Go right ahead. I'm making a room.". I make a room, play against someone, and when I go back to the room, I see a whole bunch of people saying to summerschool how I need to get banned for spamming. All I said was "Hello.", "What?", and "Sure. Yeah. Go right ahead. I'm making a room.". Next thing I know, I get kicked. I refresh the page and try to log back in, and BAM! It says I was banned. Banned for saying three things... WOW. This is barbaric. Of course, all the MODs listen to the noobs who like to lie instead of the people who have been on long enough to know not to do something stupid. Yeah. I wont name anyone right now who said this stuff, and I can't talk to Tass because he doesn't like me as well. So. The point is. Why did I get banned from MP after I did nothing wrong?". End. If you are here to flame me, don't.

EDIT: Don't be saying stuff like "Oh, you deserved that" or "You are a liar! We never did that" because it's not true and you know I'm right about this.