Well, in the āpost-postmodernā culture, identity & ideology are what drive mainstream media-influenced social psychology - both at offline social functions and in online social media! Even avocados can be quite controversial to some who think they have the right to police others - as do some adherents of CICO, for example (such as some of my own relatives whoāve gone on and off CICO wagons combined with SAD) as well as some ZC folks.
CICO and Zero-Carb and Veganism often are particular human ideologies. āCarnivoreā is simply a classification term that comes from describing non-human mammals as well as humans who āmostlyā eat flesh, based on studying how they live & survive, and the facts of life in what they leave behind.
Carnivore animals in nature can be exclusively flesh-eating if the environment or season is such that they must be, but are generally not, because apparently variety is the spice of life, to some degree
Or maybe itās just neurologically FUN to nibble occasionally on new tastes or crunchy textures 
Flesh-eating mammals such as canines and felines are well known to eat very small quantities of insects, berries, nuts, and grasses. Bears loooooove to feast on berries or honeycomb when the opportunity arises. My cats enjoy a good beetle or an olive or chunk of avocado for a treat every now and then 
Personal food culture on a food-as-medicine path of recomposition & health recovery has its seasons and learning experiences (and spices!) that are far more nuanced and meaningful than industrial foods consumer culture would have us believe in its steady stream of non-local foods and fast foods. Ever since I was in grammar school (the 1970s modern period lol) Iāve observed thereās a lot of short-term popularity when one tidily fits into the box of whatever is the socially accepted norm in certain circles.
Both Veganism and Zero-Carbism are reassuring to their adherents, perhaps due to the absolutism (without the relative angles) - reminiscent of how a religious affiliation can work for some to provide some meaning in the void of consumer culture that is often disconnected from spiritually nourishing things outside of entertainment & material acquisition.
But looking at actual traditional, land-based cultural traditions (food ways and oral histories) gives us BIG clues about our ancient ancestors, along with paleoanthrolopgy - and the huge diversity of food traditions according to the living land.
Seems to me that both Veganism and ZC consider their paths as connected to some āpureā traditional stories (as in, the actual Garden of Eden for some Vegans, and as in massively stereotyped invader-settler notions about Inuit peoples for some ZCs). Notions of food purity are also seen nowadays in the bizarrely privileged āClean Foodā ideology which when taken to the extreme is actually justifying a lot of eating disorders in some young followers. All in all, lots of privileged/āFirst Worldā problems in a world where at least a million people are starving, and countless urban peopleās brains are malnourished/poisoned.
It helps me to focus on what I have in common with most folks who I interact with in a community setting. Vegans love my avocados, lol. And I love crispy fatty perfectly grilled or smoked meat nearly as much as any Zero Carber. But I draw the line when someone tries to shame me for my Avocado Love or Lamb Curry Love.

Whatās true for me is that all āfoodā really is a baseline blessing and real food can really heal. Iām blessed - to be a fat-adapted fat burner, and to cultivate strong digestive enzymes and hormonal health with Ginger as my main ally. I know that humans generally learn through suffering rather than prevention and spiral dynamics systems theory - but Iām optimistic about food-as-medicine and lazy LCHF/keto.
