While I certainly agree that there are places still inhabited by people today where not eating meat would be almost impossible (and I pass no judgement on people who eat meat in those or any circumstances), I don’t think that in today’s world, the decision to eat or not eat meat is completely morally neutral. Things like factory farming, especially cruel methods of production to produce specialty foods like veil and fois gras, environmental issues, the use of bovine growth hormones, etc were not issues in the time of Jesus, but are part of the package for most meat eaters in westernized counties. You can certainly be a meat eater while not supporting these things by avoiding certain foods, buying local or organic, raising your own cows and chickens, etc.
So, I would say that I wouldn’t call anyone immoral for eating meat, but I think that supporting or turning a blind eye to things that go on in the modern meat industry isn’t, in my mind, a morally neutral decision.
I also agree that it is impossible to be a total vegan. Just walking around today, I probably stepped on a few ants, perhaps inhaled a gnat, and later I sat for a bit on a leather sofa. For me, I just focus on my intent. I can’t swerve to miss a bug, and in many cases, I’ve hit larger animals with my car instead of risking an accident by swerving. Since I can survive and be healthy without eating meat, there is no reason in my mind for me to eat it. Others may have systems that require meat for optimal health, so they do what they have to do.
It is interesting to me to hear about the monastic rules that go into the eating of meat. Are there any current monastaries that follow the Rule of St. Albert?