Why are so many people on Reddit insanely F'ing negative?

Is it customary to just spew your hate, be a dick about everything, talk shit and attack people? I don't know about you but when I don't like something or agree on something I just move on and spend my limited time on things that matter. Why must you feel the need to go out of your way and rip people apart, their opinions, posts etc? Does it make you feel better at night?