"that is cultural" is a shorthand for "it took us thousands of years of trial and error to achieve status quo and I want to change things right now because I think I can do better"

I'm not saying you're wrong, because I'm aware that modern life is different from our ancestors who depended on meat, but I want you to be aware of the magnitude of the force you're fighting against, and not say "it's just cultural, so easy to change". Imagine saying "the fact that most Americans speak English instead of Mandarin is just cultural, we could literally change it overnight if we wanted to".