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That was the turning point for seventies hipsters: if Elvis said ABBA was cool, then ABBA was cool.
Going after them on a long since disproven charge of "cheesiness" now is major missing-the-boat-that-sailed-thrity-years-ago--as if you hadn't heard that Karen Carpenter is also cool and went after her for being MOR or Tom Jones for being vulgar. Well, d-u-fuckin-h.
Cultural illiteracy is not an attractive quality in a critic.