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 people only hate something because the Internet tells them to.
Pineapple pizza suffers from Nickelback Syndrome
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