American Idol: A Best Legs Contest?!?

So how come American Idol judges never tell a guy that his singing was only so-so, but his "butt really looks great in those jeans?" So many times the judges will start a female contestant's negative critique with something along the lines of "you're a beautiful girl." The guys rarely hear those kinds of comments.  

Last night Jeanine Vailes was told by more than one judge that her legs looked great. Hello?!? She's trying to improve her singing. How is that possibly constructive? And how am I supposed to convince my teenage daughter that her thighs are just fine (and she doesn't even sing!).

You can see it all here (fast forward to 1:44)