Taken from this comment. https://www.reddit.com/r/PurplePillDebate/comments/ifasq2/why_do_girls_become_much_colder_and_detached_in/g2mn0xq/

Men act mean because niceness will get them taken advantage of, and women act cold because niceness will also get them taken advantage of.

Is this just the way the world works?

Although if that were true then why are people nice? If niceness is such a weakness.