Donning a pinstripe home white jersey and blue Mets cap over dress pants, de Blasio was loudly booed twice by Flushing faithful — once as he was announced and then again as he left the Citi Field diamond.... De Blasio wore No. 6 in honor of late-1960s Boston Red Sox great Rico Petrocelli, the mayor’s aides said. The infielder, who slugged 210 home runs in his 13-season career, grew up in Brooklyn. So the Boston-loving mayor managed to pay homage to his beloved Red Sox, his adopted home borough and to Italian Americans by donning that shirt. But that still...