Well, no one is teaching CRT in grammar school, it's a college level academic theory.
The problem isn't that kids are hearing about the parts of American History that paint white people in an unfavorable light, it's that they don't hear enough of it.
For instance, I recently watched a documentary on Debt Peonage in the South, which was introduced after Reconstruction Ended. To put it in context, I went to a fairly elite Catholic School in Chicago (one attended by multiple mayors) and received a degree in history from UIC. Yet I had heard very little about it.
Short version, hundreds of thousands of black people were forced back into servitude after the Civil War through debt peonage. They would be forced to work off a fine. Except they would never actually get out of debt, because their debt holder could charge them for food, shelter, etc. Now, these were not murderers and rapists. These kinds of sentences were handed out for walking along the railroad tracks, leaving a job without notice, vagrancy, or public intoxication.
This practice didn't stop in the US until 1942, when the Federal Government finally outlawed it, not because it was overcome by a sense of decency, but because they realized that in the upcoming global propaganda war, this was the kind of things Imperial Japan and Nazi Germany could point to make what they were doing look less bad.