Black people cannot I repeat CANNOT steal/take/borrow from white people. It's cultural assimilation, not appropriation.
It becomes a problem when non African or black people snatch our hair styles and claim them as their own. Many have done this. From bantu knots being called mini buns and one of the Kartrashians renaming cornrows as Bo Derek braids. Idek who df a Bo Derek really is, but it sounds white.
You can wear your hair however you like imo. It's sensitive bc what we have naturally has been called nappy, wooly, cotton in which are all in a negative connotation. Now white folks wanna come along and wear their hair as we do and all of a sudden it's a new trend or cute. THAT is my problem.
I straighten my hair no more than 3 times a year bc for one, I get to see my length, for two, I get to feel and see my scalp, and three, to clip my ends. Oh and one more, my hair will revert back to it's natural state after water hits it.