So, Hitler.

That made me laugh pretty hard!

But yes, for every behaviour however unobtrusive you can find a woman complaining about it. And it's true that is unethical not to care about that discomfort, but if you care too much, you're driven to become an asexual social bureaucrat. It's also true that if you care too little, you're driven to become a rapist.

Within these two extremes, there are all kinds of women: there are those who prefer rapist (and will get raped), those who prefer asexual social bureaucrat (and will never get approached) and everything in between.

The point is that you cannot know a priori which category the woman you're interested in fits, there's simply no standard signal to tell them apart.
That's why you should act as if you were exploring a totally different terrain every time: err on the side of boldness, calibrate along the way and leave a line of retreat.