Hating something just because other people do, and not because of your own judgemental. A couple good examples include pineapple on pizza, Nickelback, and Minecraft
Me: Why does Joe hate NickelBack?
Other friend: I think he has Nickelback syndrome.
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When you (or someone you know) hates on something popular just because of popular opinion and not because of their own personal judgement. A couple of example include, but not limited too Nickelback, Pineapple on pizza, Video games, Windows 11, etc...
Me: Why does bob hate Nickelback?
Other friend: I think he has Nickelback Syndrome