It's probably always been this way, but doesn't it seem like there are a lot of a**holes just everywhere nowadays? We are social animals, we have to deal with each other every day. Why make things so awful? Just... simple stuff. Be polite, pay attention, toss out a kindness every now and then. And if those things are too tough, then, please, at least just stop being such a jerk. Vote for the ones you wish more people would obey, and add whatever you think is missing.
Cover Your Mouth When You Sneeze/cough
Clean up after yourself
Flush the Toilet After You Use It
Don't Park Like A JerkIf you're afraid of damage to your precious car, leave it in the garage at home.
Give Others Their Personal Space...guy in line behind me. Jesus!
Be Ready When You Get to the Front of the LineIs it possible you didn't know you would have to pay?
Let People Off the Elevator Before Getting On
Take Your Loud/crying Children Out of Movie Theaters
Say Please and Thank You
Wash Your Hands
Don't Cruise Slowly in the Left Lane.
In general, don't be a d*ck.
Pay Attention to Your SurroundingsThis one can cover driving, walking, standing, sitting, etc
Hold the Door for the Person Behind You
Wave As a Gesture of Thanks When a Fellow Driver Lets You Merge or Turn In-Front of Them
Give a Thank You Wave When Someone Stops Their Car to Let You Cross.
Don't Text While Someone Is Talking to You.
If Someone Says Hello to You, Say It Back.
Don't Talk Over People
Drive With the Flow of Traffic
Mind Your Own Business
Slow Traffic Move Right!
Do Not Be Racist, Ever
Don't Smoke in Public Indoor Spaces
Don't Use Your Phone in a Movie Theater