Reading a lot of ignorant social media posts that students have a First Amendment right to walk out of school (ICE protests). Tinker vs Des Moines was a landmark Supreme Court case that sided with students who wore arm bands in protest of the Vietnam War. Students do have protected speech, BUT the justices also ruled that students cannot substantially disrupt the educational process or compromise safety of the school environment in exercising their free speech. Students walking out in mass does just that.
Yes, username checks out.

They're free to express themselves peacefully, but they're also able to suffer consequences from doing so.