Sai De Silva has had enough of costar Daisy Toye on vacation. “Who the f*** are you — a teacher?” Sai, 45, shouts in Us’ exclusive sneak peek of the Tuesday, October 13, episode of The Real Housewives of New York City. “I don’t need you to tell me how to behave.” Daisy, 39, isn’t bothered by her costar’s tone — and anger — while experiencing a cast trip hosted by Erika Hammond on Moskito Island. “OK, keep acting like that and have people not like you,” Daisy replies. Carole Radziwill Breaks Down Biggest Change Since Her OG 'RHONY' Days Sai continues, “Who doesn’t like me?...