My (21) brother (22) has constantly been a pain in my ass for entire life, and never takes responsibility for when he fucks up. We had a vacation for my birthday planned 2 years in advance just for four guys, including myself and my brother. We were only there for a day and a half when my brother drank to much, got himself hurt and had to go to the hospital because he tried to pick a fight.  One of my friends had to pay a hefty hospital bill for him, and when we got back to the hotel, they told us we couldnt stay, so we had to end our trip. No refunds, and we still had 5 days planned. When we got home, he gave me a shitty apology and didnt consider repaying me for the remaining days of the trip they we lost.  He had a drug test taken, which showed he had drugs in his system which he used as a pity move to act like he was innocent and wasnt his fault we got kicked out, even though he told me hes used hard drugs in the past. And because of that drug test, which he claims he got drugged (i dont really care if he did either way), thinks he was absolved. We share a car at  my house, and my brother usually uses it to drive to work. I told him a week in advance that i needed the car to pick up my gf because we had dinner reservations, but apparently that didnt matter to him because he decided to stay at his girlfriends house (whom he cheated on during the vacation), and thus we missed our dinner reservations.  He then crashes the car and starts flipping out people who want nothing to do with him, again deflecting the blame once he fucks uo. While ive tried to just ignore him in the past, ive become more abrasive to him and hes noticed. He always calls me an asshole if he doesnt get what he wants and one of these days i swear to god im gonna beat the shit out of him. So would i be an asshole if i reacted more cold and harshly to my cunt of a brother?