Why langau (flies) always dedicate to bad things?

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There is one similarity between langau and human which is they love to talk about something that give them no benefits to them at all. 

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So we as a human being, try to not approach and avoid to this kind of person that love to busy body about other people business. This negativity talk will lead to argument and fight to each other. So before everything worst, better you the one that need a move from this kind of person.