Before the Millennium, dreadlocks were unacceptable in most corporations.
Also, a lot of jobs required men to be clean shaven.

In most departments(not all) of law enforcement, men can’t have long hair
or facial hair for safety purposes.

A job is a professional position, not a cultural one, and every occupation has its
own physical codes and rules. Some industries and jobs are very strict. Some are
are relaxed and more casual.

This is why it is important for job seekers to know the restrictions of
the job industry that he or she wants to work in. That way there are no
misunderstandings when it comes to expectations.

It’s the same thing in the Film Industry. Some movie/tv characters require
certain looks and appearances, so an actor has to be open and willing
to sport whatever look is required for the character.