I Dont Get Why People Cant Just Get Along Is It That Hard

okay so i was on the way to school and started thinking about why people cant get along is it really that hard why do most people judge someone before they really get to know them adn i dont mean just talking to them for a few minutes and making your opinion of the person ba<x>sed on that initial impression some people you dont really know because they dont fully open up to you yet you still judge them....why i dont know but i think people should stop fighting over silly things like boys and over a girl and stuff or a promotion someone got that you wanted so you stop talking to that person and you lose that friend and you blame that person for you not being their friend now i am not saying in every single case you should get along no matter what sometimes you need to let some people go