backhanded compliment

"[…] regardless of what he may say to you, he respects your great learning, and, therefore, has immense confidence in your judgment. The poor dear cannot differentiate between erudition and wisdom." Mr. Philander, with a mildly puzzled expression on his face, turned to pursue Professor Porter, and in his mind he was revolving the question of whether he should feel complimented or aggrieved at Miss Porter's rather back-handed compliment.