Why do people watch you tube stuff they dont like?

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I was watching a comedian on you tube and I noticed that some people had put comments on there such as "Ive never like this guy and dont think hes funny" (I cleaned it up a bit) Looking around, I have notice loads more. Why the hell would you do that? You wouldnt go to the shops and pick out something you dont like and eat it. Have you seen some of the you tube fights too? They get pretty serious! WHy bother?