I have been suspended from skeptics recently for "rudeness". I have written the following on physics regarding rudeness rules and rudeness in general:
In any human society, whenever a person isn't following natural rules of etiquette, this person is shooting himself or herself in the foot, since people will tend not to listen to something that sounds rude. Nobody in the history of the world has ever achieved better results by being impolitic, so it is not in anyone's self-interest to behave contrary to etiquette. You don't have to keep people from doing something which is against their best interest, they'll do that all by themselves. This is why etiquette is a fixture of all human societies, and this is why it is taught to young children.
My position is that this fixture of human society makes science impossible. Therefore one must violate etiquette at all times, suck it up, and take the blows. You aren't doing yourself a favor, but if enough people do it, the discourse improves, and science becomes possible.
The reason science is incompatible with etiquette is because of the first rule of politics: "when you don't have something nice to say, don't say anything at all". Applying this maxim led to Aristotlism, geocentric model and phlogiston, and meant that nobody was willing to criticize these. So you need to violate this rule of etiquette in order to do science, you have to call out nonsense as you see it.
Now the thing is, etiquette is etiquette, and if you violate one rule, in the eyes of the etiquette brigade, you violated them all. So the people who get targeted by etiquette rules are those who speak bluntly and challenge a position. Further, you only apply the rules when somebody is listening, because nobody bothers to enforce rules against people who are being ignored anyway. So you only end up applying etiquette rules in situations where they are censoring somebody.
I challenge someone to come up with one example of a user who violated an etiquette rule anywhere who was punished for it and the result was harmony. I can give many examples of users who did nothing of the sort who were accused of violating etiquette, because people didn't like what they were saying, and wanted to shut them up.
The general pattern of the use of etiquette rules means that science is incompatible with etiquette rules. More generally, any academic discourse is harmed by enforcing etiquette, and some, like philosophy, end up damaged beyond repair. All discourse is improved by throwing out the etiquette book altogether, and having absolutely no rules regarding how you say things (other than requiring legibility and prohibiting spam). People who wish to say "You are stupid, and your arguments sound like they were written in poop on toilet paper on an insane asylum, and oh yeah, you're ugly!" are not doing anyone else any damage--- nobody listens to them anyway. But these people don't really exist, except as imaginary straw-men brought up when you want to set up your etiquette rules.
... (irrelevant stuff deleted) This kind of politics destroyed Wikipedia around 2008-2010, where nearly all the major long-term contributors were purged, and article writing/editing dramatically halted. For example, I got banned from Wikipedia after I was told by the administrators that I could no longer speak in favor of unbanning Brews Ohare, a retired engineering professor who was having long (in my opinion misguided) discussions about the speed of light. It is important to make sure that this doesn't happen here.
The only way to do that is to take a firm stand against any sort of [etiquette] rules, and to make sure people aren't doing politics at all, but only looking at content. It is easiest to be sure of this when people are rude, since you can be darn sure a rude person isn't doing politics.
I firmly believe this, and I hope to bring this to the attention of people higher up. There is nothing to be gained from formal etiquette rules on a site with voting, rude people are downvoted anyway, and the system naturally rewards cooperation. What rudeness rules are used for is to shut people up, to censor them, and this damages the usefulness of stackexchange beyond repair.