I didn't literally mean there should be a rule. I meant that (and someone alluded to this) it wouldn't kill us to be more polite to each other. Sure, you have the right to post a rude, mute response, but just because you have that right doesn't necessarily mean you should exercise it.
Most of you who disagree with me are actually among the people whose opinions here I respect, along with your no-crap approach to relaying that advice. I'm not saying that you should sugar coat everything you say and coddle people because you don't want to hurt their feelings. There are people who are just more abrasive than others and there are people who are more sensitive than others. I don't think it's realistic or fair to expect everyone to communicate the same way, we're all different people.
Knock people down if that's your personality, just extend a hand to help them up before you walk away.