When a man tries to over explain topics to (mostly) women who most of the time know better than him.
"Wo does this guy think he is?"
"Oh don't mind Frank, he's just mansplaining again..."
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When a man unnecessarily explains something to a woman that is either basic knowledge or a topic the woman knows more about, and she has mentioned her knowledge on that subject to him before. Most women find this annoying (though some think it's cute, myself included, but only when he's sharing because he's genuinely excited about his knowledge on that).
A perfect example is men trying to mansplain the term "mansplaining" itself, saying that the word doesn't even exist and that only feminists use it. (Hint: check a dictionary.)
Or
Woman: Yeah, and I ate an egg this morning—
Man: Actually, did you know that chickens sit on their eggs to keep them warm until they hatch?
Woman: Mhm... yes I did.
A thought-terminating cliche of sexist hate-speech with the sole purpose of claiming everything that is said is wrong solely due to it being said by a man.
Its use is usually “justified” by claiming that it is only or “originally” intended to only criticize a condescending behavior of chauvinist bullies towards their victims. Even though in all of its short history, it was was never used that way. (See: Gaslighting.)
So it is really just a specific case of the general strategy of modern bullying, where narcissists with a severe inferiority complex realized they could bully others most effectively, by claiming they are the ones being bullied. As most people sadly completely fall for this, hook, line, sinker, fishing rod, fisher and the entire boat and anchor… and can be used to amplify the bullying (aka cancel culture).
This again, is just a specific case of the “eye for an eye” revenge fallacy of thinking one’s evil is not evil “because” somebody else did evil first, even and especially if the other one’s evil is made up with prejudice in the first place. A fallacy that is, incredibly sadly and incredibly primitively, still the base of most legal systems.
Don’t fall for it. There’s just some that want to make us hate each other, to exploit it for power. But people aren’t their stereotypes. People are just people. Be it sexes, ages, nations, peoples, or whatever. If you don’t listen to those who screech, they are literally powerless.
Sexist 1 (m): If you give me seven lines, written by the finest woman, I will find something to burn her as a witch.
Sexist 2 (f): If you give me seven lines, written by the finest man, I will find some mansplaining to destroy his life!
Sexist 1 (m): Oh, *you* can’t do that! Only I am rigtheous!
Sexist 2 (f): Not anymore, grandpa!
Sexist 3 (m): If you give me seven lines, written by the hand of the finest woman, I will find something to call her a feminazi!
Sexist 2 (f): Hey, *you* can’t do that! Only I am righteous!
Sexist 3 (m): Not anymore, grandma!
Sexist 4 (f): …
…
And so on, for all eternity, because apparently everybody’s too stupid and permanently mentally immature to learn a 5500 year old lesson and end the feud.