Horror: “American Idol” was beaten in the demos on Thursday night by “Grey’s Anatomy.” This won’t be music to the ears of Fremantle or Simon Fuller and Nigel Lythgoe. The show was way down from Wednesday– a 3.5–and really down from last Thursday’s 3.1 rating. Only 11.65 million people watched last night, which still won the night for numbers of heads. But still– ABC’s “Grey’s” did a 2.9 with over 9 million viewers, “Scandal” was right behind it with a 2.7 and 8.5 million. “Idol” ratings don’t help “Glee,” which is probably coming its end anyway. But the “Glee’ number was 2.0 following “Idol.” ABC really pulled off a good show against the formerly mighty Fox pair of shows. So even though Jimmy Iovine properly took everyone to task last night on “Idol,’ including the judges, the audience was more interested in real soap operas over on ABC.