I sometimes wonder where the foundational moral intuitions that make vegans vegans come from, since obviously they are not natural or common to everyone, and those foundational moral intuitions as such are not justified and cannot be justified in terms of either moral or rational reasoning, and so must stem from personality traits and life experiences — not that that makes them invalid! all of us have foundational moral intuitions and valuesz and in all of us they are equally the product of life experiences and personality traits, not rational justification! That's simply just a property of how morality actually works. (But neither does that mean I have to accept other people's moral intuitions as true for myself and guide my actions according to them, or "respect" them; they are not mine, they are yours, and I'm not beholden to them because they don't actually motivate me. So I am emphatically not a moral relativist)
... And I will forever be convinced though that modern moralist veganism is entirely a product of the fact that 99% of people just go to the supermarket and get a prepackaged commodified little innocuous meat package, and don't ever have to think about the fact that it was once a living being and that it is essentially a corpse that they are eating, because it's so abstracted and commodified that it's easy to view meat like bread or whatever — and so when a few people actually do finally really think about the fact that they are eating the dead bodies of other animals, instead of that seeming like a natural and normal thing like it does to me, they're completely freaked out, because their entire life they've been used to thinking of meat as just this abstract commodity product!