Sexual selection has been observed in other animals. It's inaccurate to say that all men or all women are alike but it's not far fetched to think humans have certain behavioral trends.
Sure. And when these discussions on the internet happen in a vacuum of social studies or experiments it inevitably devolves into people dumping their half-baked post hoc rationalizations on each other backed by some crap anecdotes. It also inevitably turns sexist, especially given the issue at hand.