As a Canadian, I find the entire episode disturbing. Not just that it's racist, yeah, that's disturbing on a surface level, but part of the culture here has always been about keeping to yourself. Not advertising your politics or being confrontational has always been a staple and it's part of the reason we're seen as nice; in reality we're nice in a not-friendly-but-polite way where everyone keeps to themselves. Shuffling people around, and even yelling at them because of their race flies in the face of all of that.
And above all of that, Canada doesn't have a history of slavery and Jim Crow. Race was never a hot-button topic here like the States, but it's becoming that way. I grew up along side all sorts of different people, and nobody every questioned it, and now that's changing. That's what's disturbing.