It's not rubbish. Males and females are different in biological make-up and there are clearly some generalised differences which result from that. Of course individual personality often over-rides some of these factors, but at a deeper level there is a hard drive. Why would human beings be any different from other mammals and species which are divided into two sexes? Male bodies, even in childhood are programmed to be receptive to large surges of testosterone in puberty, in a way that girls bodies are not.....which is why women suffer negative health effects when they take artificial testosterone in quantities typical with males.
Testosterone, and oestrogen, both impact our mental state as well as our physical state. When you become pregnant your body is flooded with hormones which compel you to respond in certai ways; and after birth the same flood happens. Female brains are receptive to this in ways that male brains are not.Nobody is trying to put girls down. Girls ands women have absolute value and integrity as females, as well as through being individualised human beings.
Recognising that there are some generalised differences between boys and girls and between men and women is not to suggest that women are inferior. Part of the reason we are now beset by gender ideology is because of the crusade to suggest that there are no obvious differences: that being a woman or a man is just a matter of sociaisation, and that anyone, even the male of the species, can become a woman, for example, by performing gender.
Recognising that there are some differences between the sexes - in terms of trends and averages - is not to suggest that we must all be forced to perform gender roles whethere they suit us, or work for us, or not.
Girls have absolute equal opportunity when it comes to being unpleasant, mean, and so on.