Again, if you view reality - in this case, that vegan diets are better for the environment and for animal welfare - as an 'attack'... well I really don't know what to tell you. It really seems like something you need to handle on your own? Don't get mad at people for pointing out that the sky is blue and the grass is green.

I will take issue with the idea that vegan diets are more expensive. This is largely an artifact of Americans thinking you need to eat the overpriced 'fake meat' - really, fake beef, as they never seem to include mock duck. You don't. It's not even slightly necessary. As someone who has been vegetarian for years, I always roll my eyes a little bit when people talk about it.

I can make chili out of a few cans of beans, some onion and bell pepper, and chili powder. Or tacos from black beans, roasted sweet potatoes, and pico de gallo. Or stir fry with mock duck from a can and frozen vegetables. Or curry with tofu and curry powder. Or a huge number of other things that are all very cheap.

As for supplements...B12. A bottle of 100 pills is about 5 bucks. That's it.

To address your point about inavailablity...I have to laugh. Historically, meat has always been harder to obtain. A lot of vegan foods are vegan simply because people weren't able to get meat. If you're talking about prepared food like fast food, etc - sure, a lot of places don't even bother to have vegan options. But again, if you're trying to live off of takeout, you're really shooting yourself in the foot as far as cost goes. Just make some chili with cornbread and chill.