I am enjoying this thread.
It reminds of the old saying "Be kind to the young, the old, the weak, and the wrong. Because at some point in life, you're gonna be all of them."
I think being kind to others starts with self-awareness. IE: If you are aware of your own flaws, you cut other people more slack. "Wow! I started to get mad, then I realize that person is just as f**ked up as I am! Hmmmm.... displacing anger at myself towards them perhaps......."
One of the favorite flaws I actually enjoy in myself and others is..... We all understand that "Beauty is in the eye of the beholder." Yet tell that same person that "No one gets offended (internet anyone?) unless they choose to get offended!" and the huge blindspot that most of us have rears it's ugly head.
Interesting to contemplate, and a great source of relief when applied to oneself. Attempting to help others achieve similar equanimity is often viewed as nastiness.
"The road to Hell is paved with good intentions."