Similar story here - my youngest showed me a history essay which had been marked. Three spelling mistakes, none of which had been corrected. Took the essay to the history teacher, who a) didn’t know that one of the words was misspelled and b) said “spelling and grammar is English; I teach...
I didn't comment on whether it's "ok" - I queried your assertion that NSC "owes him a duty of care". I just don't see how it does, any more than the other sites I cited do. If you're instead arguing that no site on the internet should allow any criticism of anyone in the world who may be...
As far as we know, the lad isn’t a member of NSC. Which other social media sites that he’s not a member of owe him a duty of care - perhaps the RAC? The Twitter account of the Royal Academy? The Twitter account of the BBC?