Were they really? Here in France, when you meet a woman you kiss her on the cheek, but when you meet a man you shake his hand; you use different pronouns ("vous" or "tu" - cognates to "you" and "thou" in English) depending on the relative status of your interlocutor (and other things); in many western countries (the US more than France; though it seems) it still seems expected for a man to buy an overpriced piece of rock to the woman he's planning to marry and not the other way around, etc. - we have plenty of rules that depend on gender! (probably more than on class)
Is it a social blunder not to kiss a woman on the cheek when you meet her? On the same level as asking her out in an elevator at 4 AM? To be honest I'm not sure how strict the rules of etiquette were in the old days, but I think there's a distinction between customs and etiquette. Customs are things most people do and are comfortable with and no one really objects. Not following expected etiquette causes discomfort and potentially emotional harm.
I wonder how much influence etiquette has on a man buying a diamond for a woman and how much influence marketing has. In fact, I wonder just how much of our current etiquette (or at least our customs) has been caused directly by marketing and popular entertainment. I suspect we treat each other a lot like we see people being treated on TV and in movies, rather than how they would like to be treated.
Is it a social blunder not to kiss a woman on the cheek when you meet her? On the same level as asking her out in an elevator at 4 AM?
Not really a social blunder, just possibly slightly awkward, depending of the context. When I arrived in France as a little kid I found all that kissing disgusting and recoiled when someone would try to kiss me on the cheek. I later forced myself to suffer the ordeal in order to fit in socially. Now it's pretty much a habit, so I wouldn't be surprised if I eventually accidentally creeped out an American girl by kissing her on the cheek.
One of the lessons highlighted in the thread "Less Wrong NYC: Case Study of a Successful Rationalist Chapter" is Gender ratio matters.
There have recently been a number of articles addressing one social skills issue that might be affecting this, from the perspective of a geeky/sciencefiction community with similar attributes to LessWrong, and I want to link to these, not just so the people potentially causing problems get to read them, but also so everyone else knows the resource is there and has a name for the problem, which may facilitate wider discussion and make it easier for others to know when to point towards the resources those who would benefit by them.
However before I do, in the light of RedRobot's comment in the "Of Gender and Rationality" thread, I'd like to echo a sentiment from one of the articles, that people exhibiting this behaviour may be of any gender and may victimise upon any gender. And so, while it may be correlated with a particular gender, it is the behaviour that should be focused upon, and turning this thread into bashing of one gender (or defensiveness against perceived bashing) would be unhelpful.
Ok, disclaimers out of the way, here are the links:
Some of those raise deeper issues about rape culture and audience as enabler, but the TLDR summary is:
EDITED TO ADD:
Despite the way some of the links are framed as being addressed to creepers, this post is aimed at least as much at the community as a whole, intended to trigger a discussion on how the community should best go about handling such a problem once identified, with the TLDR being "set of restraints to place on someone who is burning the commons", rather that a complete description that guarantees that anyone who doesn't meet it isn't creepy. (Thank you to jsteinhardt for clearly verbalising the misinterpretation - for discussion see his reply to this post)