Of course not; that is too stifling.
All films produced by firms or companies adopting that rider, will be performing a public service.
Perhaps they can adopt a thingie like "PG" or "XXXX" so we don't even have to waste time reading the reviews...
It can cover all identity politics : sex, national origin, color (except white), religion (except Christianity), sexual orientation (except heterosexual, can't fit all 60 perversions and deviancies).
I can then extend my 4 year record of not patronizing public movie theaters indefinitely...
Matt Damon, Ben Affleck better be preparing to find themselves a new (real) job...