I really empathize. It's very hard to try to eat in a different country anyway, even if you just don't like the local delicacies; when they offend your sense of ethics and disgust you on a moral level, it raises the bar that much more.  And then even beyond that, there is the difficulty of traveling when you have life-threatening food allergies. A close friend has just discovered that in addition to her life-long, potentially-fatal peanut allergy, she's slightly less severely allergic to... well, nearly everything else. Not to the same extent of potentially dying if she walks into a room where someone is eating a Snickers Bar, but very severely all the same. I've been a distant witness to some of her travel misery, and I wonder that she can do it at all. And it only makes it worse that when she tells people no, they really must not open their bag of trail mix on the plane, because it may kill her, they think she's just being attention-seeking... much the same way I'm sure you are getting confused looks in Teruel when you tell local people that you don't eat meat.

And to, I suppose, synthesize my talk of medical dietary needs and ethical dietary needs, there are some people who have medical reasons to eat meat. I'm one of them, and I don't think it makes me less ethical or moral that I choose to do so when it could cause me permanent neurological problems if I don't. I'm not saying this to dilute your airtight conviction. I totally support my vegetarian and vegan friends. There are any number of things that I do to try to commit the lesser sin, and several other things that I should be doing, but fundamentally, becoming vegetarian is not what I see as a healthy option for me. It always hurts when I hear others state that I'm therefore necessarily immoral or amoral, as if I cannot have considered my options carefully and made a decision based on my values and my circumstances to the best of my ability.