RENO (AP) - As the Ultimate Fighting Championship made its prime-time network television debut, a small group of mothers protested what they called the latest in a string of offensive and inappropriate comments by its fighters.At a news conference Saturday outside the Las Vegas headquarters of the biggest name in mixed martial arts, several activists called on Fox Sports and advertisers to "drop" the UFC until it adopts a code of conduct like other professional sports and no longer tolerates offensive remarks.Among those speaking out against fighter Forrest Griffin's recent tweet that was criticized as making light of rape was …