rock blocker

any person or persons such as a parent, grandparent, religious group, etc. that prevents one from listening to or participating in rock music in any of its forms.

Dude: That song on the radio is pretty good. Who sings it?

Lame: That song is by Alice in Chains. Don't they worship Satan? Why don't you listen to some gospel music?
turns off radio

Dude:What a rock blocker...

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Rock Blocker

Dating someone with an aversion to the institution of marriage or the idea of getting married.

He had once had beautiful dreams of his ceremony until he started dating the Rock Blocker.