Don’t say what you are thinking.
This rule can be generalized into almost every single one of my pleasantry rules and is golden.
It is quite simple really. People do not want to know what you are thinking.
We all ride on our own little majestic high horses and have no true desire to care for the thoughts of others. We prefer to go on thinking everyone loves us no matter what we do, and we certainly do not like to be challenged with other people’s ideas or notions.
If you say nothing then you will never have to worry about saying something that will push someone away or aggravate them.
Have you ever noticed that opening your mouth starts all of your problems?