This is the ad depicting a mixed race couple with a perfectly adorable child, that apparently got on some trolls' nerves. So much so that Cheerios had to disable the comments on its youtube page.
By the way, interracial marriage in the states wasn't made "legal" until 1967, which is insane to even write but there you go.
What's interesting to me from an advertising standpoint is just how much this exposes about our own profession. People who don't work in advertising are most likely unaware of it even if they're being influenced by it. If you work in advertising in America, then you've most likely been in seriously retrograde conversations with clients concerning "diversity" when casting a spot.