CHICAGO — Against a pewter morning sky, a private plane glided over Stevenson High School in Lincolnshire Friday morning, pulling a sign proclaiming “D96, D103 & D125 UNMASK OUR KIDS!!!” as dozens of parents below rocked out to Twisted Sister’s “We’re Not Gonna Take It.” By late morning, a crew of masked teenagers aboard a yellow school bus pulling out of the parking lot at Glenbrook North High School saw the parent protesters holding signs declaring “Mask Optional Court Ruled!” and proceeded to flip off the grown-ups in unison. Just 30 miles and a world away, at Chicago City Hall, Rousemary V…