My point was that there should be no bar to clear when making a movie (or writing a novel, story, etc.). Placing artificial limits like that is exactly the type of bias you're talking about, but swinging to the other direction.
It's fine, for instance, if someone feels a really strong need to inform you that they have a pistol in their pocket. But if everyone, or even most people, are going around telling people that they have a pistol in their pocket... there isn't actually a scenario in which this says, "Things are still okay."
It's about what everyone is doing as a whole.
If a white guy kicks a black guy in the street, then hey, maybe one or both of those guys are jerks. If thousands of white guys are kicking thousands of black guys in the street, then maybe there's an issue here.