This is one of the things I disagree with. To use a consciously unfair analogy, do I have to repeatedly eat poop to be able to rightfully say, "No, I don't think I like to eat poop,"? Do I even have to eat poop once?
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Now, admittedly, some guy might see poop where I see pizza and vice versa, but I think to demand that someone "try" something before they can form an opinion is ridiculous. Now, I don't knock stuff I've never at least given a cursory examination to, but I don't usually find suffering through something I know I won't like as the proper preparation for forming an opinion.