"elsewhere and out of uniform you're obviously not under their jurisdiction"
Well yes, that is exactly what SHOULD happen.
But more and more we are seeing schools getting involved where they are not welcome, on Internet forums and chat sites, spying on what their pupils say and taking them to task over it.
If the kid says something naughty, they get their butt kicked out of school.
It doesn't matter that to an outsider, there was absolutely nothing on the Internet that would have identified the kid as a pupil of school X.
It doesn't matter that the kid used his own equipment on his own time to exercise his own rights.
What matters is some busybody teacher saw a kid doing something s/he doesn't like. The teacher then proceeds to enact a personal vendetta against the kid by implementing the revocation of his or her education and qualifications - effectively a life sentence without trial - something that surely goes against every human right in the book.
And what do we do with these rouge teachers? We give them a promotion, a £150k salary, and put their name on a plaque for civic bravery. That crosses a line on the wrong side of "police state".
In a perfect world, something VERY different would happen to these "educators". And I wouldn't like to tell you what.