I'll have to check the blog out. I have also been going back and listening/watching the nonviolent communication video's again. I watched them before but don't think I was ready to really hear what he had to say.
Sarcasm is at best a mean way of communicating, even the self deprecating talk. It's a way to put others or ourselves down while trying to mask it in humor. I never understood the use of sarcasm and the hurt it can bring as I am guilty of using it, esp. the self deprecating form. I can be funny and fun to be around and not use sarcasm or use someone as the butt of a joke.
You can not change your past, but you can ruin a perfectly good present by worrying about the future.