I do not think that is common to be vegetarian in Mexico. I am not sure that is common to have dietary restrictions in most countries other than the US and a few other places. This is not based off anything statistical or empirical, just on the reactions of people from other countries that I have visited. It is confusing to locals and often an inconvenience for whomever is cooking.
When I travel internationally, I am often forced to consider whether my ethical reasons for being vegetarian are more important than the culture that I might be disregarding. Food is an important part of a country’s culture, and I do not want to be impolite and refuse what is offered to me.
I think that it might be time, after a year of being vegetarian to reflect and consider my choice. It might be wise to veer closer to veganism in the United States so that when I travel, I can consume meat and experience cuisine more fully. In any case I am eating fish here in Tijuana, for the first time in a year and I did not miss the taste, nor was I disgusted by it. Food is one of those topics that is so personal; it is tied to our early memories, and important moments in our life, but can also be just mindless eating, or pre-packaged and cheap. Food is life, and community, and a daily ethical practice. So let us consider what we eat, and how we eat, and what happens when our choices crash into one another.