Could this be an abusive situation?

OK, I have a brother which is 6 years younger than me which means he is 16 years old. He calls me fat every chance he gets and makes a big deal out of it. He says things like. "She's fat. She needs to get away from me" or "You need to lose some weight because you're so fat and ugly."

Whenever I say something, he makes it a point to say that either I didn't pronounce it right or it wasn't the way I should have said it. Yesterday, I was talking about Abercrombie and Fitch and when I said Abercrombie, he felt it necessary to point out, in a sarcastic and loud manner, that is was such and such way instead of the way I said it.

About five minutes before I sat down at my parents computer to type this, he jerks my arm practically out of the socket and he jerks me out of the chair onto the floor. He then proceeds to sit in the chair and knocks me off of my screenname on AOL. My dad finally made him leave and now I am typing this.