"I'm 63, I don't know every pop star," he said.
"I was right in the middle of an interview, it was a little off. When you get to be my age and you've done a couple things, you have your own reality, in my reality ... I don't hug a total stranger. I have to meet someone, say hello. I gotta start somewhere ... hug isn't first moment of a human, two humans. I never did that."
The Extra reporter told Seinfeld that Kesha was a fan of his long-running sitcom, to which the comedian replied, "I'm so flattered by that, but the TV only works one way ... I can't see who's watching".
Once they were inside the event on June 5, Seinfeld confirmed that he did have a chat with the adoring pop star about his red carpet rejection.
"She was very nice about it, we laughed about it," he said.
But did she get the hug she was hoping for?
"No," Seinfeld said.