NEW YORK — Kevin Spacey’s alleged teen sex abuse victim was so sickened by the actor’s Oscar-winning performance in “American Beauty” that he never watched his movies again, a Manhattan jury heard Tuesday. Anthony Rapp said the 1999 film about a middle-aged man infatuated with his teen daughter’s best friend was the last time he could stomach watching Spacey on the big screen. “He was playing a character where he was sexually involved with a teenager,” Rapp said during his testimony at Manhattan Federal Court. “It felt unpleasantly familiar.” Rapp is suing Spacey for $40 million for allegedly …