Mayor de Blasio was booed at Sunday’s Dominican Day Parade by people angry he slammed the country’s government for wanting to expel ethnic Haitians. “He talks too much,” said heckler Francisco Bens, 53, of Brooklyn, who greeted de Blasio with scattered boos along the Sixth Ave. parade route. “He doesn’t like the Dominican Republic. ... He says Dominicans don’t like black people. That’s not true.” De Blasio hosted a press conference in June to condemn the looming deportations of thousands of people of Haitian descent from the Dominican Republic. “It is clearly an illegal act. It is an immoral act....