It’s a clip explaining what protesting is, and what racism is. Both seem like valid things to explain on a kids show. Is your issue that it’s lightly in support of the BLM protests?
The way to end racism isn’t to brainwash children that world around them is full of racists. It’s to completely ignore the concept so they grow up with no concept of racism whatsoever. Then when they’re older and first learn about it, it’s such a laughable concept that they’ll understand that only a complete idiot would be a part in it.
Racist parents exist and might be absentee enough to let their child grow up watching Sesame Street.
Cognitive bias is subtle and insidious and children are not immunized in ignorance.
To quote Proverbs: "Train up a child in the way he should go: and when he is old, he will not depart from it."