I don't recall reading that request before. I'll try to remember it.
I certainly would not want to be discourteous.
I don't know anyone who's good at reading minds, and more to the point, I don't know of any post in here where any poster has asked any other poster read minds at all, regardless of their proficiency. To cast the debate in those terms is dishonest tactic, and in particular when you ignore the actual suggestions of the person to whom you are responding, It makes it seem that you have no reasonable retort, so you must exaggerate your opponents position in order to defeat it. Since you feel courtesy is so important (historically as well as in this discussion), how about you try being courteous enough to limit your opposition to the actual suggestions that have been brought forth multiple times?
I don't know what degree of knowledge by you mean by "know". It's easy enough to read non-verbal signals and have a decent idea that a greeting will be welcome or unwelcome, this is a skill learned by almost everyone; we rely on non-verbal every day. While I'm skeptical that fully 93% of communication is non-verbal, I would expect this number to be close to half. If you were truly incapable of non-verbal communication, you would be living a very lonely life, probably incapable of passing a class or holding down any sort of real-world job. In fact, I would venture that, even if you were not certain, you had exchanged enough non-verbal cues with your not-yet-wife that, upon actually speaking to her, you had a fairly reasonable expectation that she would respond. By contrast, the woman in this video is giving several non-verbal cues that she is disinterested, and the men are not swayed. The effect is an impression that men are free to invade a woman private sphere at any time they choose.
No one asked you to do anything for womankind, except engage in simple politeness and respect (which is something you should do as much for yourself as for anyone), a trait you have no qualms asking for, but seem disinclined to extend to others.
I think all of them should so more respect.