Is EVERYBODY wrong in the post ? POST : Hey, kinda new to posting but I'll see how it goes.

Now at this point I'm not feeling to good so I went into the front room to grab a hot choclate and speak to my parents for a bit. I paused my movie in my room to go do this. My brother, who is 19 and has a decent paying job, refuses to but his own HDMI lead. And I'm a bit of a techy guy and considering I don't earn any money buying my own corded HDMI lead from ASDA (which was like £20) was quite a bit.

So as i just finished making my drink i sat down to talk and my brother storms into the front room and demands i give him my HDMI as I'm clearly not using it. I say no politely and thst i shall be returning to my room to watch my film in a minute.
He then gets pissed off and walks out and I think nothing.

Literally 5 minutes later I return to my room and find I have no HDMI lead. So I went into my brothers room and just took it back. I then start to walk out and get the usual about how I don't deserve it and things but then, after 5 seconds he gets super pissed and slams the door on my sprained wrist. Me being ill and now in agony due to my sprained wrist being slammed on, I walked into my room picked up a 2" hard back book and threw it at his head seriously hurting him.

 Am I the asshole?