Imagine a world into which a boy is born. We know he's a boy because we can see his perfectly healthy little baby penis and testicles. There is nothing shameful about noticing healthy genitals (or the sex they indicate correctly over 99% of the time.) His healthy little baby penis and testicles are not taken to symbolize anything about his innate personality nor about his future place in the world. The boy is not carefully sorted into a blue box with army toys and footballs. No such box exists. The boy is allowed to grow into his body and personality as naturally as possible. It turns out the boy likes art and reading and cooking. Sometimes he likes to wear jeans, sometimes skirts. He prefers to wear his hair at shoulder length. Nobody assumes anything about the boy's sexuality based on these neutral human interests and preferences.
The boy is taught to sort out his problems with respectful dialogue and rational compromise.
Anyone who tries to bully the boy is disciplined for unacceptable behavior.
Anyone who cannot accept the boy is a boy and not a girl is referred for psychiatric treatment.
If we can't imagine this world, there is nothing left to fight for.
Now, picture this instead: a boy is born. We know he's a boy because we can see his perfectly healthy little baby penis and testicles. His healthy little baby penis and testicles are taken as evidence of an innately dominant personality and thus justify his lifelong assignment to the dominant sex class. The boy is carefully sorted into the blue box with army toys and footballs.
This is all part of what feminists call "gender."
Some boys, of course, will go along with the blue box assignment. Some will rebel. Some will want out of the blue box entirely. Some who want out of the blue box will assume this means they should have been sorted into the pink box.
Meanwhile, some female humans - we know they are female because their healthy female genitalia were easily discernible at birth, and we can state they are female because there is absolutely nothing shameful about being female, TYVM - have been fighting their assignment to the pink box for centuries. We call these female humans "feminists." They've written reams of analyses positing this relationship between the pink and blue boxes:
They do not want into the blue box. Nor do they want to flip the boxes. They want to destroy the boxes.
Unfortunately, these feminists are operating in a world where the privileged few benefit from keeping the masses in reactionary ignorance. Thus critical thought is rare, and misinterpretation of any theory requiring even a jot of intellectual nuance runs rampant.