Pick a film. One with guns and knives in it. What are the chances that the first of a group of characters to die — whether from an army platoon or a street gang — will be black? It happens often enough that it’s frankly embarrassing: exactly what is it about non-white characters that makes it easier to dispense with them quickly rather than write them convincingly into the story?

Part of the answer is that filmmaking is overwhelmingly a white male business. There are few enough credible roles for women (especially those over 40): why would there be good ones for non-white actors? Depressing, huh? It doesn’t get much better when you think about the black characters that white writers come up with. Witness the phenonomenon of the magical negro…

Even the name makes my flesh creep…the magical negro is a character seemingly in touch with mystical powers, which he’s willing to put at the service of a white protagonist for whom he will sacrifice his own life. Stephen King has perpetrated more than his fair share of this stereotype — look at The Green Mile, The Shawshank Redemption, The Shining and The Stand for filmed examples.

Magical negroes aren’t exclusively male — the Whoopi Goldberg character in Star Trek: The Next Generation is never short of a homily when she serves drinks in the ship bar. Oracle is another insightful black mama, in The Matrix, which also features Morpheus being black and portentuous. Were such characters three dimensional, there’d not be a problem here — the issue is that they’re formed with the same cookie cutter. If Morgan Freeman is to be believed, God Himself is a magical negro, at least if Bruce Almighty and Evan Almighty are anything to go by

Much the same charge can be levelled at the martial arts masters and priests portrayed in western films. Whereas white guys over 50 can be adulterers, assassins, husbands and heroes, if your ancestry is Asian it’s inevitable that you’ll sprout a beard and spout wisdom. Nice work if you can get it, if you’re an actor…but the perpetuation of stereotypes helps nobody. Sure: there really are wise old heads of martial arts schools, but I’d lay money they’re outnumbered by mortgage advisors and civil servants and other people whose stories I’d love to see.

How do we change the racial cliches that tv and film perpetuate? I’ve taught writing classes to maybe 200 people, less than 10% of them non-white. But among their number have been some of the sharpest writers I’ve come across — one Asian woman has gone on to write a fairly well-received novel, a Caribbean woman and two Asian men have made short films, and I’m working with a non-caucasian filmmaker on a feature project.

I have mixed feelings about positive discrimination, but am all in favour of the BBC’s plans to increase the numbers of non-white writers working for the corporation. There’s more to it than that though: the whole culture of drinks-based networking is something that suits white males more than it does other people. If your religion prevents you from drinking, or you’ve got childcare to think about, a lot of industry events aren’t as welcoming as you might imagine.

It’s the 21st century. But I find that hard to believe when I go to a cinema to see a popcorn blockbuster in the form of Transformers and am presented with alien robots who have unaccountably acquired a taste for behaving like something from the bad old days of Black & White Minstrels. If you don’t get the wrongness of that characterisation, the problem of race and media is even bigger than I thought.