Why are there so many awful people?

I'm not talking about your violent, hateful, ghastly offenders. (That's another rant)

I'm talking about your everyday, go-about-their-business, snooty, self-absorbed, vitriolic, nitpicky, smarmy types.
I know there are a lot of people on the planet, but does that give one person the right to shoot venom at every person they deem "invaluable"? Aren't we all mortal, singular souls who are at the very least supposed to be getting along if not unifying on some level?

No, this isn't one person or one incident I'm referring to. It's worse. It's thousands of tiny incidents I see every day.

I'm not claiming to be without reproof. I am far from perfect.

But at what point can we all claim our humanity and treat each other with kindness? Our "social norms" are separating us more and more.