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Not everyone appreciates Andy Cohen's sense of humor.

As the New York Times bestselling author details in his new memoir, Superficial: More Adventures From the Andy Cohen Diaries, Taylor Swift didn't even crack a smile during their exchange during 2016 Met Gala after-party. As Cohen tells it, he and CAA's Bryan Lourd were waiting for Lady Gaga to perform with Mark Ronson when they bumped into Swift by the bar.

"Why I felt I needed to get involved I will never know (maybe I was auditioning for her squad?), but I innocently said exactly the wrong thing to her, which was: 'Your friend Katy is sitting in the corner and there's plenty of room around her,'" Cohen writes. "She asked, 'Katy who?' and I said, 'Perry,' at which point she clearly let me know that she's the exact opposite of her friend."

Andy Cohen, Superficial: More Adventures From the Andy Cohen Diaries

Henry Holt and Company

"I kind of gasped, realizing she was in the most famous feud of all the feuds," the Watch What Happens Live host writes, adding that he'd previously discussed the feud on his own show. He tried to smooth things over with the "Wildest Dreams" singer, but the damage had already been done. "I said at least now she knows where not to go, which I thought was a nice button on the conversation and made it all a laugh." Unfortunately, Cohen writes, "She didn't agree."

Cohen admits he was "completely mortified" that he'd said "something so moronic" to someone he doesn't know personally. "The capper is that she now thinks I'm a dick and I wasn't even trying to be shady," he writes. "I was just sticking my nose where it didn't belong."

"And I saw Katy Perry alone in a really good area!" he adds. "I failed my squad-ition!"

As Swift was walking away, Cohen says she turned around to face him, "commanding me not to say a word about this on my show, and said that she's watching. She's watching? Is that a threat? And is she watching?" the Bravo host asks. "That made me feel good momentarily good until I realized there might've been a 'f--king' thrown in there before 'your show,' or was that my scared imagination? (If she's watching my 'f--king' show, that makes it a little less exciting.)"

Cohen decided to zip his lip about the conversation. "I sputtered that I had no plans to say a word about it on my show—as a matter of fact, I silently vowed to stop playing into the hype that she created around her song 'Bad Blood,'" he writes. "Hadn't I beaten it to death anyway?"

Why tell the tale now?

"She didn't threaten me about putting it in my book," he writes, "so here we are."

Neither Swift nor Perry has commented on Cohen's story.

Superficial: More Adventures From the Andy Cohen Diaries is out now.

(E! and Bravo are both members of the NBCUniversal family.)