Beware! Crocker's Rules is about being able to receive information as fast as possible, not to transmit it!

From Radical Honesty:

Crocker's Rules didn't give you the right to say anything offensive, but other people could say potentially offensive things to you, and it was your responsibility not to be offended. This was surprisingly hard to explain to people; many people would read the careful explanation and hear, "Crocker's Rules mean you can say offensive things to other people."

From wiki.lw:

In contrast to radical honesty, Crocker's rules encourage being tactful with anyone who hasn't specifically accepted them. This follows the general principle of being "liberal in what you accept and conservative in what you send".

If you read books on communication such as How to Win Friends and Influence People, the authors go on about how just "saying what you think" is pretty much the worst strategy you can use. Not just for your own sake but for the purpose of actually convincing the other party of what you're trying to tell them. Unless they're explicitly running by Crocker's Rules and ready to squash their natural reaction to your words, it probably won't work.