Prepare to be stunned! Famed New York City restaurateur Keith McNally is spilling secrets that could rock the music world. In his upcoming memoir, "Regret Almost Everything," McNally details an encounter with none other than music icon Patti Smith, claiming she made a waitress weep with her harsh treatment.

Set in the vibrant 1970s at One Fifth, a hotspot where McNally served as general manager, he recalls frequent visits from Smith and her then-boyfriend, famed photographer Robert Mapplethorpe. But these two were more than just celebrity diners, as McNally puts it, "Smith and Mapplethorpe could be very difficult to wait on."

Referring to Smith’s behavior, McNally reveals, "It’s impossible for me to listen to a Patti Smith song today without remembering her reducing a waitress to tears because she forgot to put bread on the table." He notes that while Mapplethorpe could be terse, he never belittled the staff like Smith did.

The excerpt has ignited a firestorm on social media, with individuals chiming in. Some backed McNally, sharing their own tales of witnessing Smith's alleged unkindness. "He’s not lying about Patti Smith," one commenter shared. "I saw her rudeness years ago at a banquet." Yet, not all users agreed; many fans defended the star, insisting that she has since transformed into a kinder figure.

This isn’t the first time McNally has publicly taken a stand against celebrity patrons. Just last year, he famously called out British talk show host James Corden for his behavior at McNally’s Balthazar, labeling him a "tiny cretin of a man" and banning him from the restaurant. The intensity of that confrontation led to an apology from Corden and a lifting of the ban.

As McNally gears up for the release of "I Regret Almost Everything" on May 6, all eyes will be on how these revelations unfold and what impact they may have on Smith’s long-standing legacy in the music world.