Is this happening on campus? If so, the administrators should shut it down. There is no right to free speech on a high school campus. SCOTUS has so held. When speech gets disruptive on campus, shut it down. The brats can do it off campus on their own time.
Yes, most of the campaign appears to be related to dressing in solidarity so that can be tough to stop but even some of the stuff just beyond I might typically support even if there is no right to it (like the writing on the hands). Beyond that is obviously borderline free speech even outside of a school.
