Yes some people do that, but VERY few. It's as silly as thinking that all gay men speak with lisps, yes some do and those that do are very identifiable as likely gay. Yes there is always that guy in the bar that is inappropriate with women, and he will get noticed, but did anyone bother to look at the VAST majority of men who do not engage in that behavior. These are also the same idiots who are getting into bar fights with other men. This doesn't make it acceptable but it's hardly a hallmark of my "culture". There are people who just don't respect other people in every culture.
As to being bigger and stronger, perhaps we should look to the nation of Japan and the feats its military was able to achieve with men roughly the size of north american women. Women are perfectly capable of defending themselves, not that they should have to, just like smaller men are perfectly capable of defending themselves, not that they should have to. These are again averages and if you look at the deviances you'll see that there are a lot of women who are larger than a lot of men.
Also, keep in mind that a man is twice as likely to be assaulted as a woman so from a statistical perspective it is men who should be fearing for their safety as they post their gender online.
I personally think it's a good idea for Google to make the settings private but it doesn't need the invocation of chivalric myths and the slander of an entire culture for it to happen. Frankly, the idea that women can't defend themselves and we need to add privacy settings to protect them seems more to perpetuate the ideals of chivalry than feminism.