"Feminists treat femininity as something weak or bad or inferior! That's misogyny!"
Darling, you're completely missing the point.
It's not "evil feminazis treat femininity as inferior". Patriarchy collected 'inferior' attributes — more precisely, 'attributes which are usually related to being submissive rather than being dominant, being passive rather than being assertive, being a slaver rather than being a master, and therefore useful tools for controlling and belittling others' — and labeled them as feminine.
Skirts, high heels, long hair, and wearing makeup are not inherently feminine. Being petite or slender or curvy isn't inherently feminine. Being quiet and gentle and docile isn't inherently feminine. These things are the reins that help men control and domesticate women as they like. 'Feminine' clothes and makeups restrain women from physically using their body freely; 'feminine' body requires women to go through various things which are dangerously unhealthy or completely unnecessary; women being quiet, submissive and passive make them easier targets for men to control; etc etc. These kinds of 'femininity' are the signs of a slave.
And misogynists say that feminists who criticize these things are misogynistic for talking bad about femininity and tomboys who don't want these things are actually trans or non-bi or genderfluid or whatever other bullshit for refusing femininity.
Those things don't define being female. Not wanting those things doesn't mean we refuse to be female or secretly want to be male. That means we want to be human. Not a collective concept of frilly clothes and makeups and slender, hairless body and submission but fucking human.
This is why Korean radical feminists started 'off the corset' movement which now evolved into 6b4t. Lipstick feminists and choice feminists still have a long way to follow.