No Child Left Behind was an absolute disaster for education, poorly hidden behind an insidious name. The real goal of it was not just to defund education (in order to reallocate those funds to appease Republican lobbyists), but to stop teaching critical thinking. Not only did struggling students get left behind, but by prioritizing students who did well on standardized tests, the focus shifted entirely to teaching students memorization without understanding context, and how to guess their best on a test in order to pass. The focus became passing tests, not actual learning. In the process, students were taught that they don't need to understand the material, they just need to know how to follow directions and give the answers deemed correct by the school boards. They were deprived of agency in their own educations.
This widened the gap between public and private school educations significantly, because students in public schools learned mostly how to regurgitate information, while students in private schools learned how to understand it, analyze it, think critically about it, and apply it - in short, if you could afford to go to private school, you still got to have agency over your education. And sure, many public school teachers were dedicated and still taught their students more than the curriculum demanded, but they were under a lot of pressure and scrutiny and their hands were often tied. Many of them couldn't sustain the effort it took (and how little they got paid) and changed careers. Meanwhile basic necessarily skills disappeared when arts and non-academic budgets were slashed into oblivion - you used to be able to learn how to sew, mend, cook, budget, do woodworking, fix a car (hell, build one), paint, draw, do pottery, and so much more in elective classes. What's mostly remained is performing arts programs, which struggle to continue existing, but since you can charge admission to performances they've had a better chance than shop class and home ec.
You have no idea what it's like to have watched all that happen under the Bush administration and now see the second emerging generation of young people who were deprived of the education they deserve and don't understand critical thought or media analysis. Those of us who are old enough to remember the Bush era are frustrated, but not at all surprised to see how reductive and binary fandom discourse is, or that critical media analysis has diminished significantly and turned into fandom discourse instead (ie. that being a child during the "what you feel is more valid than facts" Bush administration has led to the second emerging generation of people who struggle to separate their personal feelings about a piece of media from the idea that fiction is social commentary, who struggle to understand nuance and are more concerned about judging others for their even slightly divergent political views than about what makes for effective activism, or that fandom has become a way for people to judge and condemn others).
You have no idea how terrifying it is to have watched No Child Left Behind unfold in your early 20s and have thought "this is going to lead to generations of kids who will be ripe for manipulation by propaganda" and to now watch how hard it is to get Gen Z and Alpha to understand the ways they're being manipulated by fascists. Believe me when I say the very real purpose of forcing education to focus on tests instead of knowledge was to create generations of people whose brains are trained at an early age to accept information unquestioningly. That's what I see when people reblog screenshots without sources and base their political opinions on tumblr funnymen.
No Child Left Behind was devastating. We knew it then and we see it now.