Her policies result in "white flight" from mixed-race school districts,  leaving predominantly black, Hispanic and other minorities in the school left behind, with less funding. In other words, more segregated. They take the white students, and the money (head-count funding) with them.
She has a right to her "different ideas" about education policy. But it is not "silly" to to expose her policies for what they really are. It is helpful to people trying to understand the issue.
https://www.alternet.org/education/school-choice-leads-segregation