First, I don’t think it’s the role of the school to make sure that students are not xenophobic or anti-social.

It is the duty of school officials to maintain civility among the students. When districts aren't already segregated by state leadership, that means cultivating a certain degree of egalitarianism and inter-racial tolerance among the student body. Similarly, teachers and admins have a duty to discourage bullying and guaranteeing students an opportunity to participate in school life without fear. That gives students the freedom to interact without fear.

Second, it took me one remedial class in college (trigonometry) to get caught up.

To a student at the high school baseline. Not a student who has been taking AP classes since junior year. This isn't just a question of meeting the minimum standard. High Schools - particularly well-funded and expertly administered schools - offer a wealth of college-level class opportunities at the high school level. And holding kids back from these schools means denying them access to a wealth of professional education and advanced tools.

the raw information was available online

Yes, it was cool to grow up in the early '00s and have a relatively reliable and robust online free-at-point-of-access reference library. Its a shame we're dissolving these resources and gatekeeping them behind paywalls, as well fill up the basic search tools with bullshit and FUD.