@Merry Andrew,
Please, Merry Andrew, that is so stale. Are you really so imbecilic that you cannot be a bit more inventive.
You might have said so many other things-for example, thus:
A person who cannot write cannot tell others how to write.
Or
What do you know of Hungarian Slang?
Or
Did you ever really learn English?
These Merry Andrew are what you could have said if you had an wit or letters to set you down, but of wit, you never had an atom, and,of letters, you need but three- A S S---An ASS.
(with apologies to the great Rostand who wrote "Cyrano De Bergerac". This was from the scene in which Cyrano encounters a "barbarian".