I always make a point of clarifying that, as a rule, I detest popular music, but that my loathing and/or total apathy towards said music has nothing to do with it being popular and
everything to do with it being terrible. It obtained it's popularity because the vast teeming mass of humanity, when measuring their intelligence in aggregate, is phenomenally retarded.
Thus saying music has "broad mainstream appeal" has become code for "this is crap that stupid people like" - there are exceptions of course, the odd
really quite good group or song will pop up from time to time, but for the most part popular music is either bland, repetitive, annoying, or a hideous combination of all those traits into a sonic anti-Voltron of lameness.
More obscure music isn't necessarily going to be any better mind you - there's a good reason most of those "bands you've never heard of" remain bands you've never heard of (that reason being "they suck") - but in terms of general offensiveness the obscure terrible music wins out over terrible popular music for one very compelling reason:
you never hear that crap on the radio.
There are other reasons people detest popular music (artists all seem "safe", songs are "shallow", popularity feels "manufactured", etc), some of which say more about how pretentious the person doing the hating is and less about the music itself (the indie snobs who hate anything that other people have heard of for instance), but the key factor really is ubiquity - pop is freaking
everywhere, most of it ranges from low-grade annoying to flat out ear poison, and even when things are good
familiarity breeds contempt.
So people don't like pop music because they find it bland, see it as an insult to musicians they perceive as not having "sold out", etc - why does it incite genuine anger instead of, at best, mild annoyance and complete apathy?
[HEADING=3]It's freaking catchy, that's why.[/HEADING]
Like annoying advertising slogans, pop hooks are designed to stick in your head and never ever go away. Sometimes, in those rare examples where a catchy song also happens to be genuinely awesome, this is great, and there is much rejoicing. But how catchy a song is has
absolutely nothing to do with how much you enjoy it, and the odds are remarkably good that if you spend any significant length of time listening to pop, you will hear songs you think are terrible but are now
unable to forget, ever, even if you try really really hard. In fact those songs will probably crowd out the songs you actually
wish your brain would put on repeat, and they'll spring up whenever you don't want them to, for decades to come!
As a courtesy to anyone who's actually reading this post, I will
not list prime offenders by name as that's almost certainly bound to make your brain start playing them for you again
aiee make it stop why do you remember stuff like this I hate you brain argh!!!, and I would hate to unintentionally inflict that pain on anyone, but that phenomenon right there is why popular music is bound to get people far angrier than say... progressive rock: If you didn't like the progressive rock song, the odds are good that, after you stopped listening to it, you don't remember it anymore.
Pop is forever, and this is why we hate it.