I'm still grunka-ing (grunking?) but the leggings as a hair towel tip is a tit version of the Curly Girl Method, where you use a t shirt to dry your hair. The idea is that cotton is better for textured/curly hair than your standard towel. You're meant to gently scrunch the hair with a t shirt, not rub it, as rubbing can cause frizz and damage textured hair. I can't bring myself to watch her stupid cartoon video because she always looks like Shane MacGowan when she has that daft filter on - is she scrunching or rubbing?
Either way, the cotton t shirt trick is something POC have been doing for years, and the Curly Girl Method has come under a lot of criticism for what people perceive as white women repackaging hair care techniques and terminology from the black community. So to see her taking this idea as a #JackShack is questionable at best.
AND JACK DOESNT EVEN HAVE CURLY HAIR SO THERE'S LITERALLY NO BENEFIT. Use a towel you basic b.