At the time when Madonna, Prince, Michael Jackson, (and I'll throw 'Born In The USA' era Bruce Springsteen in there as well) were popular, the whole of pop music absolutely blew IMO.
We're talking utter garbage like Wham, Su Sudio and ABACAB era Phil Collins, Let's Get Physical by Olivia Newton John, Stuck On You by Huey Lewis, etc.
I strongly dislike Michael Jackson and I only like 2 or 3 Prince songs though I realize he is an extremely talented guitarist.
I didn't have any older brothers or sisters, but I had friends in HS whose older brothers introduced us to that period's alternative music and by the time I got to LSU (85) these are the bands I was into for the most part:
vintage RCHP (Freaky Styley in particular)
and plenty of others along those lines.
I was also into a LOT of blues and some jazz having grown up in N.O. and seeing tons of that live.
Classic rock was something I was pretty burned out on by the mid-80's but I've always appreciated Stones, Dylan, Doors, Zep and still go back to that stuff frequently.
There are tons of alternative/indie bands that I love from the 90's, early 2000's right up to a good number of 2012 releases.
I feel like I'm pretty diverse, but I never have been into pop music for the most part.
Music snob rant ON[ ] OFF[x ] now