You are correct! In all my cooking classes i am required to tie my hair up and plastic bag it.
My instructors don't want me getting it caught in the meat grinders or slicers. And hair collects a lot of dust particles you don't want around food.
One instructor in Holland asked me plastic bag it twice when making cheese chocolates.
The instructors in Italy required me to plastic bag it twice also. They don't want any hair particles in the spaghetti and meat balls. And heaven forbid if a hair gets into your Italian wine! A real disaster!