As much as I want to be optimistic with you, no. I do not think they are, at all really. Starting when I was in Preschool I listened to Disturbed, Papa Roach, etc. because of my father. In elementary school my school bus played hip hop all the way to and back from school. My bus driver even organized a little thing to have us sing Smack That by Akon (think that is how he spelled his name) for the principal.
When it comes to music, as long as most of the swears are semi censored, most people do not care what kids sing. They just think they don't understand and that it is fine. Oh, and this was not some super liberal school either. They'd meltdown if you wore a hat inside and it was a small enough school that they could get away with having regular Christian elements present.
