See, therein lies a bit of a problem.
Like others have said in this thread, context is key and 'white male' leads are so overrepresented that doing so (excluding minorities) would be seen as oppressive. Because it is. It's kind of like the 'always punch up, never punch down' concept of comedy. You can tease and belittle and trivialize the plight of those in power and that's okay but you can't do or say the same things to those who have historically been repressed or otherwise subjugated.
It's why we have a gay pride parade but can't have a straight pride parade.
It's why we have black history month but don't have a white history month.
It's why we have women's days but not men's days.
In a perfect world, it would be equally as racist (or not racist) to say "I only want to make films featuring black/white casts and crews. But we don't live in a perfect world, we live in a flawed world with centuries of history informing what is and isn't acceptable. Saying "I want to represent the black community because I've seen enough white material in my life" is fine, but the opposite is oppression. If you can't see that, then you really do need to - and I hate saying this - check your privilege. On the surface and without any qualifiers the two statements are equal, but history makes them unequal just like how in the past women and men, black folks and white folks, gays and straights, have not been considered equal.
And until we live in a world where people of all genders, races, sexes, orientations, ethnic backgrounds, skin colours, religion, or any other qualifier are treated with utmost, infallible equality, it will continue to be okay to push for minority inclusion but NOT okay to push for more majority representation. Sure, the LAW may consider these things equal, but in practice, they are not. you, and everyone else in this thread, really need to factor that in before you resort to 'reductio ad absurium' in order to try to make things sound crazy by reducing them to their most simplistic variants.