Haute takes are flying over John Galliano’s Met exit. The British designer, 65, pulled the plug on his planned Costume Institute retrospective, “John Galliano: Horizons,” and Met Gala theme Monday — a decision he and the Metropolitan Museum of Art said they made jointly after weeks of mounting backlash. “I do not want the debate surrounding me to place the Met in a difficult position or to distract from the remarkable work of the Costume Institute,” Galliano wrote in a statement published on Instagram. “I also recognise and respect that an exhibition honouring my work would be painful for some.” Galliano was fired from Christian Dior in…