Sometimes they might just hate a particular type of music. For example, I think My Chemical Romance are awful. If I truly, truly hated them with a passion, I might troll their fans. Some of them might have a superiority complex that makes them think they listen to better music than everyone else. Some of them are just perfectly stable people doing it for kicks. Some might have some stupid reasons (such as trolling fans of Blues music because you're racist, etc).
I'm guessig you're just on about music trolls, right? Because trolling in general is a whole 'nuther matter.
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