Okay, my brother is 18. He should be mature right? Wrong, when we argue he does nothing but mock me. He just squeels in a high pitched voice not even making words supposedly indicating to me that I'm whining. Ever single time he's ever done this I speak calmly and ask him nicely to stop and argue like a fucking normal person. But yet he persists, and I wanna bash his fucking face in with a baseball bat. Fighting him is out of the question, I'm 5'9 200 lbs, and hes 6' 230lbs, built like a friggin house. What should I do?