wtf is a wrong rune?

someone said i have wrong runes for about every champ i played....... while i was half trolling in normal games i still feel a bit insulted there's no such thing as a "wrong" rune i could google what's meta and blindly follow it or i can also go aery yasuo or pta morgana if i wanted to fk this wrong runes bs there is no such thing EVEN IF I WASNT TROLLING ITS STILL A MATTER OF PREFERENCE seriously wtf is a wrong rune can't fathom such a concept
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