A post on the notorious website states, Get #goBaldForBLM trending on Twitter and Instagram. The idea is to get women, particularly white women, to shave their heads for BLM. Guilt them into getting rid of their straight white hair to show solidarity with black women.
4chan has successfully trolled leftists into believing all manner of absurd things in the past, including them introducing the idea that the OK hand sign was code for white supremacist.
The #GoBaldForBLM Twitter hashtag was subsequently spammed by K-pop fans in an effort to hijack it, but for some women the damage was already done and that hair is going to take a while to grow back.
I think there is something instinctive in giving up hair as a sacrifice. Like when Rose McGowan shaved it all off is a public show of grief/pain during MeToo. Or other SJW women cutting it mostly or all off to intentionally uglify themselves, an act of moral peacocking.