My guess is that while many people would like to be able to ask others whatever they like or tell other whatever they like, they don't like when others do the same to them. But that's just a hunch.

I have frequently noticed that when geeks advocate untrammelled honesty in communication, they mean sending it; the same geeks reliably hit the roof when they receive it.

Relevant post: Defecting by Accident - A Flaw Common to Analytical People