Each day as I travel through downtown Tucson I am amazed at how quickly the most ancient of human behaviors have changed. For as long as there have been Homo sapiens - roughly 200 000 years - people have filled their lives principally with two activities: talking directly with other people and doing physical things.
If it's very painful for you to criticize your friends - you're safe in doing it. But if you take the slightest pleasure in it that's the time to hold your tongue.