Let's get something straight here.

Cows and sheep are herbivores, they can only digest vegetation. Lions and Tigers are carnivores, they can only digest meat. Humans and pigs are omnivores, they can digest both vegetation and meat.

Some humans elect to vacate their rightful place in the food chain and opt to eat only vegetation. Others will object to certain foodstuffs on religious grounds, others will eat some animals but not others on what they consider to be ethical reasons that are really aesthetic reasons.

I can find no rational reason for one human being to despise another on the grounds of which particular species they choose to eat, although I take a dim view of people eating people.

muffing