Lazy statement that “sourcing” a vegetarian meal is difficult.
Eating less meat is better for your health and better for the planet.
The few exceptions I think worth noting are if you were born into and continue to live in largely/culturally hunter culture (Inuit, bushmen) or where you live is not sustainable for agriculture (Tibet.)
Most folks could just cook more rice, beans, greens and be fine.
I'm suggesting the opposite.
by design eating meat is morally questionable. (as do so many things with our modern society.) all meat is fair game, because all animal dependent diet is questionable anyway.
And literally no vegan has a problem with people who medically need to eat meet doing so. I own several cats, they are carnivores. The problem is scale: The fact that some people medically must eat meat does not give a free pass for apathetic barbarism to the rest of society.
Even collectively cutting out a single meat or dairy-based meal a week would contribute to a massive reduction in demand. You have no excuse. Use this energy to build a fairer world for all animals instead of using it to get defensive whenever someone brings up how massively inhumane modern factory farming is.