"Carnism" is a word I just discovered in this Vox piece. It gets 150,000 hits in Google; it has its own wikipedia page.
It seems to mean the opposite of "veganism", designating the set of beliefs, attitudes, and social institutions which lead most Americans to eat meat from various animals.
Without getting into it much, I can buy the likelihood that some societies will come to see meat eating as undesirable or repulsive, perhaps on the level with smoking, perhaps someday equating it to racism.
In that possible future I wonder how our descendants will think of us--if political correctness still reigns will all statues of meat-eaters be removed. Logic would argue so.