I know its not really "pop" but does anyone actually listen to the lyrics in underground/extreme metal? I think its a blessing that most of the time they are delivered in a bestial grunting, making it literally impossible to make out dodgy lyrics about the usual morbid bollocks...
Can't say I have ever listened to metal of any sort--though I've been looking to be shown something that would musically overcome the cartoonish tone (and, I admit, imagery, though I'm usually pretty good at ignoring ephemera in my evaluation of music).
But your point raises an interesting sub-question--is there any vocal pop music the lyrical content of which you make a concerted effort to ignore, because you like the music so much?
I do this with Tyrannosaurus Rex, for sure--the music is oddly cool (despite acoustic guitar + bongos formula) but when I realised the lyrics seemed genuinely to be about Tolkein and magic and whatnot. . .
I admit I've sometimes been guilty of ignoring a modicum of racism/homophobia/misogyny in local hip-hop when I lived in the Southern US--but only to an extent could I do so (something I've always found troubling in the nothing-is-political stance of some pop-ists).
Oh, and I remembered lyrics to which I do pay attention--the Shaggs! That stuff is unadulterated brilliance, and suits the music perfectly.