There is a world of difference between thinking men should only approach women if they would also approach a man with the same comments and/or attitude.
Would men really tell other random men to 'smile' regularly?
Would they accuse another man who simply did not want to engage of being ignorant...possibly followed by 'bitch'? Or if the man made it fairly clear they didn't want to be talking to a randomer...wuld they keep trying to 'just have a conversation'?
Would they strike up random conversations with other men on buses, or on a street? Would they, when accidentally bumping into other men (and I mean genuine accidents, not 'accidents' such as pressing ones boner into arses on trains on puspose...'accidents' meaning, accidents that may also reasonably happen towards/involving another man also)...apologize but then follow it up with 'oh you are quite handsome aren't you', or 'what a lovely smile you have'...whilst 'just' complimenting, of course.
Would they when finding themselves sat next to another man on a bus, start chatting to them? What about if there were a few seats between them, but no phsyical person separating them?
Would they, upon finding themselves getting off the same stop as another man on a train, make a point of saying that they are heading in the same direction? And maybe ask where the man is going and why?
If in any of these situations, they would behave/speak the same way, then fair enough. If not, then just don't as its different behaviour based soely on the sex of the person on the recieving end, not 'just being friendly'
Yes some women like this. They may find it validating or they may simply be a chatty person. Their reasons for liking this behaviour are entirely their own.
But I don't think its unreasonable for men to bear the 'would you say the same to another man' in mind. Nor do I think the women on this thread are unreasonable for suggesting this.
Its not really 'don't ever speak to women you don't know'. Its much more about 'don't speak to women you don't know solely because they are a woman'.
Obligatory NAMALT, not all women like the same thing, and 'some women do it too' addition. As seems to be necessary.