Like phoenix, I've kept sheep and always considered that animal welfare was paramount. I don't mind people being vegetarian or vegan, it's up to them, and I eat quite a few vegetarian meals.
Three points, though. If they object to meat-eating, why is so much veggie and even vegan food pseudo-meat (e.g. veggie sausages)? Secondly, I feel that much of the effort put into objecting to meat-eating would be better used fighting for better animal welfare. Finally, no meat, milk products or eggs means no animals as they certainly won't be worth keeping.