system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] Why are unicorns such sexist bastards?
gpt
I assume your referring to Unicorns unwillingness to be handled by male students in the Care of Magical Creatures Class.

Over several thousand years Unicorns went from being plentiful across Europe to incredibly rare, now confined to a few reserved areas like the Forbidden Forest. This was partly due to the reduction in wild areas but mainly as a result of hunting by both muggles and wizards, who valued their horns, blood, etc. for their powerful magical properties. 

As a response to being hunted they grew to be cautious of humans, and especially male humans because those were the ones most likely to be hunting them in medieval times. Although Wizarding were more egalitarian than muggles they were still fairly medieval in their attitudes. So hunters would almost exclusively men. 

Its not clear whether this is a learned reaction* or a product of the selective pressure of Unicorns that avoided human males being more likely to reproduce), but whatever the mechanism it developed into an increasingly strong instinct over generations. Young females by contrast were not historically a danger to them, and could in some cases be a positive force.

Obviously in the modern era muggles are prevented from interacting with unicorns, and wizards regardless of gender treat them with respect and reverence, but an instinct developed over thousands of years doesn't fade quickly. 

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*^^Unicorns ^^are ^^a ^^powerfully ^^magical ^^species, ^^which ^^means ^^they ^^are ^^intelligent ^^but ^^not ^^in ^^a ^^way ^^that ^^is ^^very ^^comprehensible ^^to ^^humans. ^^Some ^^wizarding ^^researchers(cf ^^Boggins ^^et ^^al.) ^^have ^^theorised ^^they ^^can ^^communicate ^^with ^^one ^^another ^^via ^^transference ^^of ^^memories, ^^which ^^would ^^allow ^^the ^^message ^^that ^^male ^^humans ^^were ^^especially ^^dangerous ^^to ^^be ^^transmitted ^^between ^^them ^^swiftly ^^and ^^passed ^^on ^^through ^^generations.