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It seems that a dialect is just an unofficial or "off grid" system of language. A dialect cannot be "wrong" if there is a group of people who all understand this system of language and can communicate with each other in this system. That is the purpose of language, to communicate. Some dialects are easier to understand if you are outside that dialect, so those might seem "less wrong." Some dialects are very difficult to understand to an outsider, so those might be interpreted as "more wrong," but that doesn't hold water if the people within the dialect all understand each other. So the prejudice against dialects to me is just a misunderstanding of how language lives in communities is that can unfortunately feed into biases and prejudices.