While making up only four per cent of the population, they feature in over half of all commercials. Advertising bosses also seem obsessed with featuring mixed-race families, even though they constitute a small minority in the real world.
Of course, liberal politicians and commentators ripped into Pochin and dismissed the concerns of anyone who thought she had a point. Their attitude was: "Only racists care about this stuff."
It's remarkable, isn't it? The very people who have spent years seeing race in every area of life - literally counting the numbers of ethnic minorities in parliament, our public services, in industry, the media, entertainment and our universities, and telling us that white people were overrepresented everywhere - are suddenly pretending that they don't see race at all and that any disparity in one particular sphere isn't worth bothering about.
What hypocrites they are. Who do they think they are kidding?
It is plain right that black people are represented in advertising. But that's not the issue here. The point that Sarah Pochin was making, albeit clumsily, was that the massive overrepresentation of black people cannot be incidental.
It is instead a blatant attempt to force-feed us a view of Britain that is bogus. And it is being done for political reasons. Advertising executives, like other members of the professional and managerial classes, are desperate to be seen as "progressive" and "inclusive" - the better to win social kudos. And so they portray the world in a way they know will meet with elite approval.
But, ultimately, it's a false world. We know we are being subjected to a relentless political lecture. We are being told: "This is what our society should look like, and if your world doesn't resemble it, you are doing something wrong." That's why it jars. Not everyone sees the country from the vantage point of a well-heeled liberal sophisticate from Islington.
Why shouldn't we be allowed to call out this fakery when we see it? After all, if it's acceptable to say that a particular group is underrepresented in a certain field, it should be acceptable to say that it is overrepresented, too.
Better still, why don't we dispense with these attempts at social engineering altogether? All that matters is that nobody should be prevented from pursuing their chosen path on the grounds of skin colour. Beyond that, there is no duty to enforce certain demographic outcomes.
Our elites have been obsessing about race for a generation. They did so because they believed it would make us a more unified and harmonious country. How wrong they were.
The entrenchment of racial identitarianism throughout our public life and institutions has, in fact, made us more divided than ever.
That is why millions are exasperated with race activism. They see its disuniting effects around them and understand how it now infects and devours everything before it, to the point where many are scared to begin honest discussions about race.