(replies to this thread a year and half late) aight.
i can't really add on much to the opinions already shared. i specially agree with peace and beni's, because they particularly resonate with my own experience.
before i was fourteen, i used to listen to mostly american/european indie pop/rock acts and the like, and i still think most of what i listened to was nice despite not listening to much of it nowadays. when i turned fourteen i met a pretty large group of friends, all of whom were into VK in all of its different variants, and so the exposition Begun. in that sense, while i tried to stick by my own standards in what i liked, i still very much believe it had to do with a thing of maturity and exposition, at least when you're young and naive and whatever. despite the jokes in my re-introduction thread, i still have some SuG songs on my phone, think Lycaon's first LP was neat as hell and that a lot of gazette's NIL songs made me. pretty emotional, so to say. but even so i don't really listen to VK much at all now although 95% of my music taste is japanese based. i think in my case, it was a thing of expanding my horizons and actually getting to know what was out there.
in the end, as Champ originally stated and Peace commented, i think people who drastically change their preferred acts and genres often aren't really as into them as they seem, though there's a lot of other factors that can change what you enjoy music wise that could be perceived as that. in fact, i think there's way too many things that can influence what you music you enjoy: what did you grow listening to, whether certain acts have had a personal impact on key moments of your life, whether you prefer intrumentalization over vocalization/viceversa, if you like listening to the radio in your way to walmart, etcetera etcetera. there's people who like to vary a lot on what they listen, and people who can listen to the exact same thing everyday. so, i'd say it's a bit hard to pinpoint that sort of issue in the abstract.