Why do girls always get the short end of the stick?

From answers I have read on this site, guys have no empathy for women who are used by players. So why do so many guys feel bad for "nice" guys that can't get any? Just seems like the male version of the girl taken by a player. Neither one is experienced in dating, yet for some reason, nice guys get cut some slack. Double standards much?
Why do girls always get the short end of the stick?
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