Hi Ben,
As others have said above me, it's all about moderation.
I don't know if this will help or not, but my oldest son is 16. There have been times when I have had to say the exactly same thing to him that your dad said to you. What is the cause or motivation behind it you may ask?? Well I don't know if this applies in your situation, but what had led me to say it to say this to my son is some of the following. When my son is on his computer is his dedicated 100% to what he is doing on it, so much in fact that he neglects doing his chores, when his sister (or anyone else) asks him something he snaps a response back. He hurries through his homework to get to his computer....pretty much everything else is simply an annoyance to him other then playing his computer. When it is time for bed I don't want to tell him anymore it is time for bed, I have told him for 16 years, he can tell time as well as I can.
Basically what I think your dad is looking for is for you to handle playing this game with responsibility. I believe he might be feeling that while you are living at home there are other things you are responsible for. Weather it is true or not, he may have the impression that playing the game has taken top priority and with that all other things will be neglected. Thus his response is to remove the thing that is (in his mind) causing you to loose focus on other things in life.
If I can make a suggestion? While taking a break a never a bad thing, I would suggest just being open with him. When your going to play...let him know that everything else you need to do is already done (he might check to make sure it is
) or if it is not tell him when you are going to do it (then do it as you said you would). Tell him that while your playing that if he needs anything just let you know. If your bed time is 10pm, at 9:58 make sure he knows you are off the game and going to bed.
I hope this makes sense...I am trying to help you understand where I think your dad is coming from, the same stance I have to take at times with my son. Believe it or not, I actually hate having to take this approach with my son. But at times I feel a drastic action is the only thing that will resolve the overall problem. I am sure your dad takes no pleasure in having to do the same. The easier you make it on him...the easier it will be on you