Every single person I know well has a double standard for something. Such as “I don’t need to improve my driving but everyone else sure does” or a “do as I say not as I do” rule, etc. Though certainly some more than other. This leads me to believe all people do it in some way.
Is it simply human nature?
Yes, I believe it is. I think everyone is a bit of a hypocrite by default and we all ought to strive to apply the same rules to ourselves as we do to others