"Carnism is the invisible belief system, or ideology, that conditions
people to eat certain animals. Carnism is essentially the opposite of
veganism; "carn" means "flesh" and "ism" denotes a
belief system. Most people view eating animals as a given, rather than a
choice; in meat-eating cultures around the world people typically don’t
think about why they find the flesh of some animals disgusting and the
flesh of other animals appetizing, or why they eat any animals at all.
But when eating animals is not a necessity for survival, as is the case
in much of the world today, it is a choice - and choices always stem
from beliefs."
carnism.org