What did the guy say to george in Seinfeld episode for him to respond with jerk store?

In the "Seinfeld" episode titled "The Comeback," George is insulted by a coworker named Jerry. Jerry tells him, "The jerk store called, and they're running out of you!" George later uses the phrase "jerk store" in his comeback, feeling it was the perfect response to the insult. The line becomes iconic as it encapsulates George's struggle to come up with a witty retort.