Maybe it's because for some of us music really matters, so some twat treating it as a bit of a trendy in joke is really irritating. Whereas the people you mention clearly love what they do, and humour is just part of it. I suspect I don't really do irony. Like the old Bill Shankly quite "some people think football is a matter of life and death, but it's much more important than that".

I struggle to reconcile the notion that music should be all po-faced and earnest and that just because people think it's important. I mean - looking to my right on this very page, "The Last Temptation of Chris". Anyone going to drill the Difford for that?

Some people (I suspect) treat film the same way, for others it's books. No-one I know espouses the opinion that, say, Woody Allen or PG Wodehouse are cheapening and reducing their respective medium. Some people, dare I say it, treat humour - across all media, the way you treat music. Why should music not have access to the full spectrum of content? Everything else does.

I think it might just come down to perceived quality and preference, Twang.

Is it either:-
a) Any Good, or
b) No Good?

There's loads of earnest, worthy music that leaves me just as, if not more, cold than a throwaway, pun ridden, upbeat thing. I only care whether, in my subjective way, it's any good or not.

Whether, to misquote someone, it says something to me about my life.

Your subjective criteria is clearly different to mine, and c'est la vie, but I'd go toe-to-toe with anyone who made the assumption that they liked music more than me just because I don't dislike, or get wound up by, humorous content.