Many years ago I was at a wedding with a couple of friends, and we found ourselves on a table with a guest who did palm readings. She looked at one friend’s palm and waxed lyrical about what a lovely person she was; how kind, clever, successful etc etc. I was nodding and smiling but inwardly thinking “Pfft, yes but she can be bloody irritating and argumentative”.
Second friend had a turn and was told “You are very sad about being single, you really want to be in a relationship and it is affecting you quite badly”. Poor friend got quite teary; I was thinking “Yes this is true but she really doesn’t help herself for blah blah and blah reasons!”
My turn. The woman took my palm, shook her head and said “Oh, you are so critical! Why so critical of your friends? You must try to be kinder.” 
Bang on. I was mortified. I have never forgotten it and have tried very hard to be a better person ever since!