Taste of beer causes chemical reward.
Fragment of a discussion from Comments:Study: Taste of beer causes chemical reward in male brain
Does the same thing happen with someone that strongly dislikes the taste of beer?
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I wondered that myself. It's not immediately clear, to a layman, what the practical difference is between "the taste of beer releases a pleasure-response chemical" and "the subject likes the taste of beer".
The abstract of the study indicated that the subjects "rang[ed] from social to heavy drink[ers]." My guess is the scientists picked only those who actually liked beer somewhat and didn't select those who dislike beer.