The Left today is obsessed with teaching racially divisive ideas. See this CRT summary for the main ideas. This used to be just a Jewish Marxist thing, but now it has infected the Democrat Party, schools, news media, Hollywood, and big companies.
So what is the problem? That we all live with? Is it the girl? The federal marshals? The graffiti? The painting seems to be deliberately ambiguous.
David French, who pretends to be conservative but more accurately described as controlled opposition, writes:
The complaint also takes issue with Norman Rockwell’s painting The Problem We All Live With, which depicts Ruby Bridges walking to school with the “n word” in the background and originally appeared, in 1964, in Look, a general-interest magazine published in Des Moines, Iowa. That’s right: They’re complaining about Norman Rockwell.If parents wants to remove the books, the obviously the books are controversial.
Why would parents appeal to a law meant to combat critical race theory to censor deeply troubling but wholly uncontroversial books?
French claims to be a free speech advocate, but I don't see him saying that the schools should teach all the arguments for and against racial segregation. That would be essential to learning about America's racial history.