Judging seems to be a default setting in humans.
It’s not just easy, it’s as natural and normal as breathing.
I know I have been guilty of judging others negatively, but what I was actually doing was projecting negative thoughts about my own flaws onto them. And I’m not accessing my long term memory when I think of examples of this.
I’m not sure if becoming more accepting of human nature comes with age or with experience. I just know that as I’ve gotten older, and had more experience interacting with more and more people, I am (slowly) becoming more accepting of the fact that to be human is to be irrational.