"Yeah, what if I wanna make it my problem? Why are you throwing your guitar around and acting like a moron, huh? I asked you, so answer."

Why is he owed an answer? Because he wants one. He can't see any reason why he should be refused anything he wants and if someone's going to keep him from getting it, then that someone is getting their ass kicked. That's just how the world works, as far as he's concerned.