You might want reconsider your ready acceptance of institutionalized discrimination and repression.
“Figures of speech” often codify and institutionalize the biases of cultural power structures, in this case patriarchy.
The fact that such codified biases have been part of languages “forever” is an indication of how deeply entrenched and longstanding such biases are, across a wide variety of cultures.
So “man up,” “put on your big-boy pants,” “grow a vagina,” and get hip to how language can be powerful tool of repression. Language can and should change, and so should attitudes like Seatower’s.