"I resemble that remark" effectively parries an intended insult. The insult is deflated because the recipient accepts the characterization as accurate. It is particularly effective against those who have the innate need to attempt to "zing" everyone with which they come into contact. By "resembling" rather than "resenting" the zing, you take the fun out of it for the zinger and they move on to other victims. Also, it was a parody by Groucho Marx , no?