I get what this is trying to say, but I prefer the more descriptive, "Men's brains are waffles, women's are spaghetti."

**presenting the sexes as polar opposites who may as well come from other planets contributes to sexism..** - the idea that men and women are inherently different is more often than not used to justify sexism, claiming that men are naturally aggressive while women are submissive by nature for example. there is no real basis to it as socialisation plays just as big a role, if not a bigger one in determining our characteristics/personalities. - [this article](https://www.google.com/amp/s/www.forbes.com/sites/singularity/2012/08/13/men-are-from-mars-so-are-women/amp/) explains it best by stating 'these sexist, one-size-fits-all assumptions are the reasons why men and women grow up to have such different personalities even though we are born the same.' - this idea promotes a misunderstanding of the other sex for either side by implying we are too different to even bother trying to know one another on a deeper level than assumptions.

This phrase originated from the book [_Men Are from Mars, Women Are from Venus_ (1992)](https://en.wikipedia.org/wiki/Men_Are_from_Mars,_Women_Are_from_Venus#Criticism_of_the_book), written by John Gray who was an American author and relationship counsellor. The book states that the most common relationship problems between men and women are a result of fundamental psychological differences between the two sexes – ultimately men are women are so different that they are from distinct planets. The book sold more than 15 million copies and has become a common metaphor in popular culture. However, it has been criticized for perpetuating social stereotypes and fails to acknowledge the social construction around gender.

Definitely a sexist idea.