I was just kinda mean to my little brother who is a condescending prick most of the time?

Sibling rivalry never easy but remember this is your brother not an enemy . Try and compromise write out a list of times for the tv etc it sounds as if your brother just wants your attention and pushing your ons to get it. Can you perhaps suggest going out somewhere together the cinema or bowling try to involve him in your life i think you will be surprised how well you will get on. Orwoulld you rather as you got older hate him? Cut him out of your life? Its time to change the way you see each other before the its to late