I think the reality is that the vast majority of media, period, is about and targeted to white people. If you were to take up ALL the media, you'd realize minorities are still very under represented.
Also it makes people feel good when they're represented. White men won't admit that, because for them they're always represented. And when they're not its a problem, so clearly even they understand the power of representation.
And, lastly, if you LOOK you can see white people are still in almost every ad. They're just not the only people in the ad. This is a problem of greed, the white man does not settle for anything less than 100%.
Keep in mind I'm saying this as a white man. The world is truly made for us and our success. On the off-chance it's not this one time, we need to be okay with that and learn to get over it.