As the old primary song says, “kindness begins with me”. It not only makes others feel better, but it improves one’s
own perspective and view of the world. There will always be rude people, and sucky people will continue to suck, but when one makes an effort to be friendly and kind to others, the sucky people aren’t as obvious.
Of course, bring friendly isn’t always easy, but it can be habit-forming if you stick to it, and can also be contagious.
Now, to be perfectly honest, I’m not always a friendly guy myself, so my advice is more of a do as I say than a do as I do.