It's seen as a defence mechanism for when you run out of arguments.
English
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But what if I'm still giving arguments?
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[quote]But what if I'm still giving arguments?[/quote] Then your arguments are automatically rendered invalid. A person who tries to devalue another is one a person who lacks any value themselves. You lose your credibility. The purpose of communication is to exchange ideas and information to improve society and/or yourself. If you don't abide by that motive, and you instead wish to tear another down, then your perspective loses worth. And then a different person can come by with your exact arguments but be worth considering and respecting just because that person is being respectful.