CRITIC, n. A person who boasts himself hard to please because nobody tries to please him.

    There is a land of pure delight,
        Beyond the Jordan's flood,
    Where saints, apparelled all in white,
        Fling back the critic's mud.

    And as he legs it through the skies,
        His pelt a sable hue,
    He sorrows sore to recognize
        The missiles that he threw.
                                                            Orrin Goof

This definition is from The Devil's Dictionary by Ambrose Bierce, published in 1911.