while this is not from a song, a guy I used to date was fond of saying (with regard to his graphically violent novels and short stories) :

"If you can't stand the meat, get out of the abattoir" (french for slaughterhouse).

That phrase leaked over into the film business (in which my husband works and I used to work) and now film folk we know use it to tell eachother they are in the wrong business if they are complaining about violence or violent content.

of course, it's a variation on "if you can't stand the heat, get out of the kitchen."