PROVINCETOWN Town leaders here are holding a public meeting today to air concerns about slurs and bigoted behavior. And this time, they say, it's gay people who are displaying intolerance. Police say they logged numerous complaints of straight people being called "breeders" by gays over the July Fourth holiday weekend. Jamaican workers reported being the target of racial slurs. And a woman was verbally accosted after signing a petition that opposed same-sex marriage, they said. ...though police say they do not consider the incidents hate crimes. ......[T]ensions are rising in part because of strong feelings about same-sex marriage. ...A group...