Comedian Mario Cantone hammed it up for a friend’s birthday celebration at the Darby on Saturday night. The 53-year-old “Sex and the City” star took the stage for a performance of “New York, New York.” But another diner was celebrating a 25th birthday the same night, and when a cake was carried out, Cantone remarked, “Everyone is too [bleeping] young; I hate every single one of you.” He later critiqued his own less than pitch-perfect performance: “If you find my voice box, give it back to me.”