For me, it's a tie between One Directioners and those several thousand obnoxious PewDiePie fans who think he copywrites anything he touches. Both would kill you if you speak out against them. Seriously.
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You forgot Beliebers. And I like the Pewds, but I'm not one of those psychotic little kids who thinks everyone copies him. I really don't care, I just watch his videos for laughs.