Piggy-backing off the 'food you wouldn't serve company' thread, it seems like there are certain foods that divide rather than unite--i.e., for the most part (always exceptions) people have passionate feelings either for or against the taste of these foods:

Liver and other unusual cuts or types of meats (people either go to the ends of the earth for the best sweetbreads or tripe or run for the hills if it is served)

Licorice--either they throw out all of the black jelly beans or send away for the best of the best

Anchovies (especially on pizza) and sardines

Cilantro

Garlic and oninons

Pistachio ice cream (I'm thinking of brooke, here!)

My big aversion--coconut! Ick! But I see it everywhere, and I know people adore ie passionately

Cincinnati chili or chili with/without beans

Chicago deep dish pizza

Spam (those from Hawaii and those not from Hawaii)

Very sugary candies (gummi bears, Sweet Tarts, etc)