Functionally, public education is just as much a right as free speech is.
Wait, seriously? Free speech requires that one open their mouth and voice an opinion, or write something down, both actions completely performable by one human being, absent interference or assistance from any other human. It doesn't infringe on anyone, or oblige anyone to do anything.
Public education requires that someone provide that education. Now, unless you have a secret society of pro bono teachers in your pocket, that means someone has to pay the teachers in public education. Meaning it comes out of my gorram pocket via taxes.
A right does not inherently involve action on any other beings part beyond staying out of the way and allowing that right to happen. Right to bear arms, right to free speech, right to worship as we choose, those are "rights". Public education is NOT a right. I would agree that everyone has the right to seek knowledge to the limit of their abilities and influence.
As for the change in curriculum, I see it mostly as a reversal of the crap they've taught in public schools for years, and thus a good thing, were it not for the exclusion of Thomas Jefferson. I don't care if he buggered bunnies out behind the woodshed, or worshipped Satan, he is one of our Founders, and kids should be learning about him. If we have to have public schools, that is.