"You may scold a carpenter who has made you a bad table, though you cannot make a table. It is not your trade to make tables."
Samuel Johnson, 1709-84 -- one of the most distinguished of critics. Samuel Johnson was an ignorant fat pig, who amongst his even more ignorant quotes than the one you mentioned was
The noblest prospect which a Scotchman ever sees is the high road that leads him to England.
Samuel Johnson was an Establishment lackey and a glutton who considered his own unpleasant remarks to be witty