Everyone can be vegan - just eat vegan, and maybe go further. Veganism is for everyone, in every industry, with any occupation, and situation, and any levels of awareness or ethics. Calling anyone "not real vegan" - especially knowing that being vegan is not a rewarding social position - is unnecessary demanding and even intimidating fashion among vegans, detrimental to the spread of veganism, imho. I observed it for years, and never witnessed anything good or productive resulting from it.
They are called into existence by human artifice that they may drag out a short and miserable existence of slavery and disease, that their bodies may be mutilated, their social feelings outraged. It were much better that a sentient being should never have existed, than that it should have existed only to endure unmitigated misery.