There is no freedom of speech issue here. There is no issue of censorship here. None.
The most one could say is that it’s poor form for a government minister who runs a Facebook account - presumably with a view to promoting herself and her policies - to manage the account so that opposing views are removed.
I’ve no doubt that if, say, a Tory minister arguing for Brexit or for benefit cuts or for stronger union legislation on his/her Facebook account had done this, a lot of Labour and Lib supporters would have been on here taking issue with it.
But they’d have been wrong and the private school enthusiasts are wrong now. And it’s making the parents look pathetic.
God knows why Phillipson or any other minister would have a Facebook account anyway. It looks so desperate.
Irrelevant side-comment. You don’t see a lot of Bridgets around these days, do you?