It really doesn't matter, because the rationale you provided was essentially: it is wrong because I don't like it. To keep with your utilitarian line of thinki

It really doesn't matter, because the rationale you provided was essentially: it is wrong because I don't like it. To keep with your utilitarian line of thinking, a position against cannibalism based on disease transmission would make more sense. Personally, I prefer the classic argument of it being the ultimate violation of personal space - but that is likely because I favor Locke's theory of property and the mixing of labor.